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Efficient synthesis of 3-alkyl-2-(-1H-1,2,3-triazolyl)methyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivative via multistep synthesis approach by novel Cu@Py-Oxa@SPION catalyst


In this pared, an efficient method is introduced for the synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivatives. These novel products have both 1,2,3-triazole and quinazolinone in their structures. For the synthesis of these products, a novel catalyst is designed, synthesized, and characterized by the immobilization of copper onto modified magnetic iron oxide. The catalyst (denoted: Cu@Py-Oxa@SPION) was characterized by several characterization techniques. In this regard, 16 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivatives were synthesized in high isolated yields (77–86%). As an advantage, the catalyst is highly recoverable and its activity has not decreased after 7 sequential runs. The method is very efficient for the synthesis of the products in high isolated yields under mild reaction conditions in a green solvent. The scope of the method is broad and several examples were successfully synthesized using starting materials with different functional groups.

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Catalytic reactions are of high interest, due to their advantages in organic synthesis, including high isolated yields of the products, milder reaction conditions, and performing the reactions in green and environmentally friendly solvents. These advantages have led to several studies on developing catalysts to overcome their drawbacks, including difficulties in separation from the reaction mixture and its reusability. An interesting approach for this purpose is to immobilize the catalysts onto nanoparticles [1,2,3,4,5,6,7,8,9]. Among different nanoparticles, magnetic nanoparticles in general, and iron oxide nanoparticles in particular, are interesting nanoparticles to be used as support for the catalysts. Iron oxide nanoparticles are chemically and physically stable, magnetically separable, and easily synthesized and functionalized. Therefore, these nanomaterials are of high interest to be used as support for catalysts [10,11,12,13,14,15,16,17,18]. Copper is a transition metal that is used as a catalyst for several chemical transformations [19,20,21]. This metal has been used as a catalyst in several reactions, including oxidation [22,23,24], reduction [25, 26], carbon–carbon coupling [27,28,29], and alkyne-azide cycloaddition click reaction [30,31,32,33].

Copper(I)-catalyzed alkyne-azide cycloaddition click reaction is an interesting and efficient reaction for the synthesis of 1,2,3-triazole derivatives from the reaction of an alkyne and an alkyl azide. This reaction is fast and efficient and the products are easily synthesized in high isolated yields using copper(I) as the catalyst [34,35,36]. 1,2,3-Triazolea are significant due to their valuable properties as antiplatelet [37], dye [38], antioxidant [39, 40], antimicrobial [41,42,43], and anticancer [44,45,46]. On the other hand, quinazolinone and its derivatives have shown vast biological properties, such as anticonvulsant [47], anticancer [48,49,50], and antibacterial [51,52,53] properties. In addition, quinazolinone derivatives have enhanced the lubrication properties of oil [54,55,56]. Therefore, several efforts have been focused on the synthesis of the quinazolinones, especially using green solvent and conditions [57,58,59,60,61,62,63]. Regarding the significance of quinazilinones and 1,2,3-triazoles in modern medicinal chemistry, in this paper, we report the synthesis of novel 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivative (Scheme 1).

Scheme 1
scheme 1

Chemical structure of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one containing quinazilinone and 1,2,3-triazole

The synthesis is performed in 4 steps with commercially available chemicals in efficient and facile methods. The synthesis of the products is presented in Scheme 4. Novel Cu@Py-Oxa@SPION catalyst is introduced and synthesized for alkyne-azide cycloaddition click reaction in this synthesis.

Results and discussion

In this study, we have introduced a highly efficient and eco-friendly method for the multistep synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivatives. These novel products possess unique structures that combine the 1,2,3-triazole and quinazolinone moieties, making them valuable compounds in the field of medicinal chemistry. The key feature of this study is the development of a novel catalyst, denoted as Cu@Py-Oxa@SPION, which is based on the immobilization of copper onto superparamagnetic iron oxide nanoparticles (SPION). This catalyst was synthesized via a simple and straightforward process that involved the encapsulation of SPION by silica, followed by functionalization with 2-(pyridin-2-yl)-1,3,4-oxadiazole, which was used as a ligand for the copper catalyst. The entire synthesis process of the catalyst is presented in detail in Scheme 2. The newly developed catalyst showed remarkable performance in the synthesis of the target compounds, yielding high isolated yields (77–86%) under mild reaction conditions and in a green solvent. Importantly, the catalyst demonstrated excellent recyclability, with no loss of activity observed after 7 sequential runs. This characteristic is particularly significant, as it not only enhances the sustainability of the process but also makes it economically viable.

Scheme 2
scheme 2

Synthesis of Cu@Py-Oxa@SPION catalyst

After the synthesis of the catalyst, Cu@Py-Oxa@SPION was fully characterized by several characterization techniques. The successful synthesis of the catalyst was studied by FT-IR spectroscopy. The FT-IR spectrum of Cu@Py-Oxa@SPION is presented in Fig. 1a. Figure 1a represents silica coated SPION. The characteristic peaks at 1078 and 583 cm−1 belong to Si–O and Fe–O vibrations, respectively. Hydroxyl group vibration of the catalyst could be observed at 3328 cm−1. The magnetic properties of Cu@Py-Oxa@SPION catalyst are presented in Fig. 1b. for better comparison, the VSM results of silica coated SPION and Cu@Py-Oxa@SPION catalyst are compared in Fig. 1b. It is clearly observed that the catalyst shows superparamagnetic behavior. A decrease in the magnetization of the catalyst could be correlated to the functionalization of the magnetic nanoparticles by different groups. However, the magnetization is intense enough for the magnetical separation of Cu@Py-Oxa@SPION catalyst from the reaction mixture. For the determination of the copper content in the structure of the catalyst, ICP analysis was used. The results showed that each gram of Cu@Py-Oxa@SPION catalyst contains 3.71 mmol of copper (Additional file 1).

Fig. 1
figure 1

a FTIR; b VSM results of Cu@Py-Oxa@SPION catalyst. In the FTIR spectra, the red line (denoted a) shows SiO2 encapsulated SPION the black line (denoted b) shows SiO2 encapsulated SPION and the blue line (denoted c) shows Cu@Py-Oxa@SPION catalyst

The structures of Cu@Py-Oxa@SPION catalyst were studied by SEM and TEM microscopy methods. The SEM and TEM images are presented in Fig. 2a, d. Based on the results, the nanoparticles are spherical with an average size of 22 nm with a very narrow polydispersity. The particles are uniform and no aggregation or agglomeration was observed, which could due to the functionalization of SPION by silica and 2-(pyridin-2-yl)-1,3,4-oxadiazoleis, which prevents the aggregation of the nanoparticles. In addition, energy-dispersive X-ray spectroscopy (EDS) analysis was carried out to confirm the presence of copper in the catalyst (Fig. 2e). The EDS spectrum obtained showed the characteristic peaks of copper at the appropriate energy level, indicating the successful incorporation of copper into the catalyst structure. The intensity of the copper peak was strong, suggesting a high percentage of copper in the catalyst. The EDS analysis provided clear evidence of the presence of copper in the catalyst and supported the characterization data obtained from other techniques. Overall, the EDS analysis confirmed the successful synthesis of the Cu@Py-Oxa@SPION catalyst and its potential for use in catalytic reactions.

Fig. 2
figure 2

a, c SEM; and b, d TEM images; and e EDS result of Cu@Py-Oxa@SPION catalyst with different magnifications

After the characterization of Cu@Py-Oxa@SPION, the catalyst was used for the synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-ones. As could be seen in Scheme 2, the challenging step of the reaction is the last one, which involves the click reaction for the formation of 1,2,3-triazole heterocycle. Therefore, this reaction was optimized by performing the reaction in different solvents, in the presence of various amounts of Cu@Py-Oxa@SPION. In addition, the reaction is performed in the presence of non-immobilized CuI to compare the results of the synthesis of the desired products by Cu@Py-Oxa@SPION and nonimmobilized copper catalyst. The results are presented in Table 1. It could be observed that Cu@Py-Oxa@SPION has acted much more efficiently than CuI. In addition, the presence of Cu@Py-Oxa@SPION catalyst is essential for the reaction performance, while performing the reaction without the catalyst has not led to the product.

Table 1 Optimization of the reaction conditions

Having the optimized reaction conditions, the scope and the generality of the method was evaluated by using different substrates. The results are presented in Table 2. It should be observed that all the substrates have given the corresponding products in high isolated yields.

Table 2 Scope and generality of Cu@Py-Oxa@SPION catalyzed synthesis of 3-alkyl-2-(-1H-1,2,3-triazolyl)methyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivative

As an advantage, Cu@Py-Oxa@SPION catalyst is its reusability. For studying the reusability of the catalyst, Cu@Py-Oxa@SPION was separated from the reaction mixture and used in the next reaction without any further purification. The recovery of the catalyst was repeated for 7 sequential reactions. The results are presented in Fig. 3. It could be observed that the activity of the catalyst has remained constant after various reaction runs. In addition, for studying the leaching of the catalyst, a model reaction was performed and the reaction mixture was stirred for 12 h. After 12 h, the catalyst was separated by an external magnet and the solution was analyzed for the presence of copper. During the recyclability studies, the stability of the Cu@Py-Oxa@SPION catalyst was evaluated by analyzing the copper content in the reaction solution using Inductively Coupled Plasma (ICP) analysis. The results showed that there was no detectable copper in the solution, indicating the high stability and reusability of the catalyst. In addition, in another reaction, the catalyst was separated from the reaction mixture before the completion of the reaction. The performance of the reaction was studied after the removal of the catalyst by GC and the results showed no performance in the reaction that confirms the necessity of the presence of the catalyst for the reaction.

Fig. 3
figure 3

The recovery of Cu@Py-Oxa@SPION catalyst

For the best characterization of the stability of the catalyst, Cu@Py-Oxa@SPION catalyst was characterized by SEM. The SEM of the recovered catalyst is presented in Fig. 4. Based on the result, the catalyst did not show change in its structure after being used in the reaction.

Fig. 4
figure 4

SEM image of Cu@Py-Oxa@SPION catalyst

In comparison to previously reported catalysts for the synthesis of 1,2,3-triazole-containing compounds, the Cu@Py-Oxa@SPION catalyst showed excellent performance. For instance, the Cu@Py-Oxa@SPION catalyst had a shorter reaction time and a lower catalyst loading compared to previously reported catalysts. Furthermore, the catalyst exhibited high stability and reusability, retaining its activity after multiple runs. In addition, the methodology presented in this work is a green and efficient synthesis route using a benign solvent, which makes it more environmentally friendly compared to other reported methods.

A possible mechanism was proposed and suggested for the synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one products using Cu@Py-Oxa@SPION catalyst. The suggested mechanism is presented in Scheme 3. According to the suggested mechanism, the presence of the catalyst is critical for the synthesis of the product. The copper attached to the catalyst play an important role in the activation of the alkyne, which subsequently undergoes nucleophilic attack by the azide group. The resulting intermediate then undergoes cyclization with the help of the copper catalyst to form the desired triazole ring. The immobilization of the copper onto the SPION nanoparticles is believed to enhance the stability and reusability of the catalyst, making it an attractive and efficient option for this type of multistep synthesis.

Scheme 3
scheme 3

Possible mechanism for the synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one products using Cu@Py-Oxa@SPION catalyst


General remarks

Solvents, reagents, and chemicals were obtained from Merck (Germany) and Fluka (Switzerland) Chemical Companies. Melting points were taken on a Kofler hot stage apparatus and are uncorrected. The IR spectra were obtained on a Nicolet Magna FT-IR 550 spectrophotometer (potassium bromide disks). Nuclear magnetic resonance spectra were recorded on Bruker FT-500 spectrometers using tetramethyl silane (TMS) as the internal standard in pure deuterated solvents. Chemical shifts are given in the δ scale in parts per million (ppm) and singlet (s), doublet (d), triplet (t), multiplet (m), and doublets of doublet (dd) are recorded. Mass spectra were recorded on an Agilent Technology (HP) mass spectrometer operating at an ionization potential of 70 eV. The elemental analysis was performed with an Elemetar Analysen system GmbH VarioEL CHNS mode. Purification of all products was conducted by column chromatography on silica gel using petroleum ether and ethyl acetate as eluent. Thin layer chromatography was carried out on silica gel 254 analytical sheets obtained from Fluka. Column chromatography was carried out on the column of silica gel 60 Merck (230–240 mesh) in glass columns (2 or 3 cm diameter) using 15–30 g of silica gel per one gram of the crude mixture. Transition electron microscope images were recorded on a HITACHI S-4160.

Synthesis of silica encapsulated SPION

For the preparation of SPION, two micro-emulsions were prepared. The first one contained a solution of FeCl3·6H2O (202 mg), FeCl2·4H2O (75 mg), and cetyltrimethylammonium bromide (CTAB) (1.8 g) in 2.045 mL of deionized water as the aqueous phase, and toluene (29 mL) as the organic phase. The second micro-emulsion contained 1.8 g of CTAB in 29 mL toluene and 25% ammonium hydroxide solution (2.65 mL). The two micro-emulsions were mixed in a three-necked flask under vigorous stirring at 7000 rpm at 50 °C under a constant flow of N2 gas for 60 min. The dark precipitates were separated using an external magnet and washed with boiling EtOH from impurities. The obtained SPIONs were dried under vacuum for 12 h at room temperature.

For coating magnetic nanoparticles with silica, a solution of 200 µL of tetraethyl orthosilicate (TEOS) in 40 mL ethanol was added to a mixture containing 1 mg of SPION in 10 mL of deionized water under vigorous mechanical stirring followed by the addition of 1.25 mL of aqueous ammonia (25% w/w). After 1 h, the obtained magnetic nanoparticles suspension was magnetically separated and washed twice with deionized water. The SiO2@SPION product was separated and dried under reduced pressure at room temperature for 12 h.

Synthesis of 2-(pyridin-2-yl)-1,3,4-oxadiazoleis ligand

Picolinic acid (10 mmol, 1.231 g) was weighed and added to methanol (15 mL). Then, sulfuric acid (100 µL) was added to the solution and stirred at room temperature for 12 h. the reaction mixture was neutralized by the addition of a 0.1 M solution of NaOH. The solvent was evaporated and the product was recrystallized from ethanol. In the next step, methyl picolinate product (5 mmol, 0.685 g) was dissolved in ethanol, and hydrazine (7 mmol, 0.2240 mg) was added. The reaction was stirred at room temperature overnight and the product was purified after the removal of the catalyst by recrystallization from ethyl acetate to form pure 2-((hydrazinyloxy)carbonyl)pyridine. In the next step, 2-((hydrazinyloxy)carbonyl)pyridine (4 mmol, 0.612 g) and KOH (5 mmol, 0.280 g) dissolved in ethanol (15 mL) and then CS2 (4 mmol, 0.304 g) was added. The reaction mixture was stirred under reflux conditions for 18 h. After the reaction was completed, 5-(pyridin-2-yl)-1,3,4-oxadiazole-2-thiol ligand was purified by recrystallization from ethanol.

Synthesis of Cu@Py-Oxa@SPION catalyst

Silica encapsulated SPION (500 mg) was added to dry ethanol (10 mL) and sonicated for 30 min. after that, 3-(chloropropyl)-trimethoxysilane (10 mmol, 1.987 g) was added and stirred at 70 °C for 12 h. after that, the product was separated from the reaction mixture by a magnet and washed 3 times by toluene, ethanol, and acetone, respectively. The product was added to dry toluene (10 mL) and sonicated for 30 min. Then, 5-(pyridin-2-yl)-1,3,4-oxadiazole-2-thiol ligand (3 mmol, 0.540 g) was added and stirred for 24 h at room temperature. Then, 75 mL of CuCl (0.04 M) was added to a mixture of the above product in dichloromethane and was allowed to stir at r. t. overnight. The product was separated, washed with water, and EtOH, and then dried at r. t. The Cu@Py-Oxa@SPION nanocatalyst was obtained as a dark powder. After that, Cu@Py-Oxa@SPION catalyst was separated and washed with toluene, ethanol, and acetone and dried in a vacuum oven for 24 h.

Synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivatives

In the first step, isatoic anhydride (10 mmol, 1.630 g) was added to water, and amine (12.5 mmol) was added. The reaction mixture was stirred at room temperature and the reaction performance was monitored by TLC (hexane/ethyl acetate, 5:95). After the completion of the reaction, the product was filtered and washed with cold water, and dried in air. To the product (5 mmol) in ethanol (10 mL), was added CS2 (5 mmol, 0.380 g) and stirred under reflux conditions. After the reaction was completed, it was poured onto ice water and the product was filtered and purified by recrystallization from ethyl acetate. To this 3-alkyl-2-thioxo-2,3-dihydroquinazolin-4(1H)-one product (5 mmol) in DMF (20 mL), was added K2CO3 (8 mmol, 1.104 g) and propargyl bromide (5 mmol, 0,585 g) and stirred at 75 °C for 12 h. After the reaction was completed, the 3-alkyl-2-(prop-2-yn-1-ylthio)quinazolin-4(3H)-one product was separated by the addition of the reaction mixture to the ice water mixture, followed by washing in cold water 3 times.

For the synthesis of the products, 3-alkyl-2-(prop-2-yn-1-ylthio)quinazolin-4(3H)-one (3 mmol) was added to ethanol (10 mL), and 2-chloro-N-alkylacetamide (3 mmol), sodium azide (3 mmol), and Cu@Py-Oxa@SPION catalyst (50 mg) as added. The reaction mixture was stirred at room temperature and after the reaction was completed, the catalyst was isolated from the reaction mixture by a magnet. The solvent was removed and the product was purified by recrystallization from ethanol. The synthesis steps are presented in Scheme 4.

Scheme 4
scheme 4

Synthesis of 3-alkyl-2-(((4-(2-oxopropyl)-1H-1,2,3-triazol-1-yl)alkyl)thio)-2,3-dihydroquinazolin-4(1H)-one products using Cu@Py-Oxa@SPION catalyst

Spectral data of the products


M.p. = 195–197 °C; IR (KBr): υ = 3168, 3126, 3084, 1665, 1601, 1241 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 9.72 (s, 1H), 8.15 (s, 1H), 8.03 (d, J = 7.9 Hz, 1H), 7.76 (t, J = 7.5 Hz, 1H), 7.60 (d, J = 8.1 Hz, 1H), 7.42 (t, J = 7.5 Hz, 1H), 7.04 (d, J = 3.8 Hz, 3H), 5.31 (s, 2H), 4.59 (s, 3H), 2.09 (s, 6H), 1.53 (d, J = 6.6 Hz, 6H); 13C NMR (126 MHz, DMSO-d6) δ 164.42, 161.07, 156.70, 146.67, 135.46, 134.99, 134.26, 128.17, 127.58, 127.21, 127.18, 126.56, 126.38, 126.23, 123.25, 119.92, 52.82, 46.07, 27.62, 19.56, 18.43. Anal. calcd. For C24H26N6O2S: C, 62.32; H, 5.67; N, 18.17; S, 6.93. Found: C, 62.65; H, 5.39; N, 18.03; S, 7.14; MS (70 eV): m/z = 462 (M+).


M.p. = 214–215 °C; IR (KBr): υ = 3170, 3128, 3086, 1667, 1601, 1240 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 9.72 (s, 1H), 8.15 (s, 1H), 8.03 (d, J = 7.9 Hz, 1H), 7.76 (t, J = 7.5 Hz, 1H), 7.60 (d, J = 8.1 Hz, 1H), 7.42 (t, J = 7.5 Hz, 1H), 7.04 (d, J = 3.8 Hz, 3H), 5.31 (s, 2H), 4.59 (s, 3H), 2.09 (s, 6H), 1.53 (d, J = 6.6 Hz, 6H); 13C NMR (126 MHz, DMSO-d6) δ 164.98, 161.41, 156.12, 146.67, 140.22, 134.92, 133.62, 131.06, 127.16, 126.60, 126.53, 126.35, 126.28, 123.93, 120.40, 119.13, 118.03, 52.78, 45.81, 27.46, 19.56. Anal. calcd. For C22H21ClN6O2S: C, 65.35; H, 4.51; N, 17.92; S, 6.84. Found: C, 65.17; H, 4.72; N, 18.08; S, 6.99; MS (70 eV): m/z = 468 (M+).


M.p. = 231–233 °C; IR (KBr): υ = 3175, 3136, 3084, 1666, 1602, 1243 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.61 (s, 1H), 8.22 (s, 1H), 8.05 (d, J = 7.8 Hz, 1H), 7.76 (t, J = 7.6 Hz, 1H), 7.62 (d, J = 8.1 Hz, 1H), 7.58–7.46 (m, 4H), 7.43 (t, J = 7.5 Hz, 1H), 5.33 (s, 2H), 4.62 (s, 3H), 1.56 (d, J = 6.5 Hz, 6H); 13C NMR (126 MHz, DMSO-d6) δ 164.82, 161.44, 156.20, 146.70, 138.22, 134.93, 132.18, 126.56, 126.53, 126.37, 126.34, 126.28, 121.56, 120.42, 115.86, 52.75, 46.09, 27.50, 19.59. Anal. calcd. For C22H21BrN6O2S: C, 51.47; H, 4.12; N, 16.37; S, 6.24. Found: C, 51.74; H, 3.97; N, 16.19; S, 6.07; MS (70 eV): m/z = 512 (M+).


M.p. = 208–210 °C; IR (KBr): υ = 3172, 3130, 3088, 1669, 1603, 1242 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 8.75 (t, J = 5.9 Hz, 1H), 8.12 (s, 1H), 8.04 (dd, J = 8.0, 1.5 Hz, 1H), 7.76 (td, J = 7.7, 7.1, 1.6 Hz, 1H), 7.60 (d, J = 8.1 Hz, 1H), 7.42 (t, J = 7.6 Hz, 1H), 7.11 (q, J = 8.1 Hz, 3H), 5.12 (s, 2H), 4.58 (s, 3H), 4.24 (d, J = 5.8 Hz, 2H), 2.25 (s, 3H), 1.54 (d, J = 6.6 Hz, 6H); 13C NMR (126 MHz, DMSO-d6) δ 165.73, 161.42, 156.24, 146.69, 136.51, 136.07, 134.96, 129.30, 127.81, 126.56, 126.34, 126.24, 126.07, 126.04, 120.42, 52.09, 47.67, 42.55, 27.47, 21.10, 19.56. Anal. calcd. For C24H26N6O2S: C, 62.32; H, 5.67; N, 18.17; S, 6.93. Found: C, 62.16; H, 5.89; N, 18.35; S, 7.16; MS (70 eV): m/z = 462 (M+).


M.p. = 198–201 °C; IR (KBr): υ = 3168, 3134, 3088, 1669, 1602, 1238 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 11.08 (s, 1H), 8.24 (d, J = 9.1 Hz, 2H), 8.21 (s, 1H), 8.05 (dd, J = 8.0, 1.5 Hz, 1H), 7.83–7.75 (m, 3H), 7.63 (d, J = 8.0 Hz, 1H), 7.48–7.40 (m, 1H), 5.40 (s, 2H), 4.62 (s, 3H), 1.56 (d, J = 6.6 Hz, 6H); 13C NMR (126 MHz, DMSO-d6) δ 165.81, 161.45, 156.23, 146.70, 144.95, 143.00, 135.01, 131.63, 128.25, 126.57, 126.55, 126.40, 126.31, 125.60, 119.44, 52.78, 48.62, 27.44, 19.59. Anal. calcd. For C22H21N7O4S: C, 55.11; H, 4.41; N, 20.45; S, 6.69. Found: C, 54.95; H, 4.24; N, 20.29; S, 6.88; MS (70 eV): m/z = 479 (M+).


M.p. = 212–215 °C; IR (KBr): υ = 3174, 3132, 3089, 1671, 1605, 1243 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.43 (s, 1H), 8.19 (s, 1H), 8.03 (d, J = 7.9 Hz, 1H), 7.76 (t, J = 7.7 Hz, 1H), 7.61 (d, J = 7.7 Hz, 1H), 7.54 (d, J = 8.0 Hz, 1H), 7.42 (t, J = 7.5 Hz, 1H), 7.30 (t, J = 7.7 Hz, 2H), 7.05 (dd, J = 11.6, 5.4 Hz, 2H), 5.29 (s, 2H), 4.60 (s, 3H), 1.54 (d, J = 6.5 Hz, 6H); 13C NMR (126 MHz, DMSO-d6) δ 164.57, 161.43, 156.22, 146.69, 138.82, 135.47, 134.96, 129.34, 128.17, 127.18, 126.55, 126.36, 126.27, 124.19, 119.61, 52.70, 48.79, 27.49, 19.58. Anal. calcd. For C22H22N6O2S: C, 60.81; H, 5.10; N, 19.34; S, 7.38. Found: C, 60.98; H, 5.22; N, 19.56; S, 7.47; MS (70 eV): m/z = 434 (M+).


M.p. = 206–208 °C; IR (KBr): υ = 3171, 3128, 3086, 1666, 1601, 1243 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 9.72 (s, 1H), 8.13 (s, 1H), 8.09 (d, J = 8.0 Hz, 1H), 7.84 (t, J = 7.9 Hz, 1H), 7.71 (d, J = 8.2 Hz,  H), 7.59–7.36 (m, 7H), 7.05 (s, 3H), 5.31 (s, 2H), 4.48 (s, 2H), 2.11 (s, 6H); 13C NMR (126 MHz, DMSO-d6) δ 164.42, 161.16, 157.12, 147.67, 136.16, 135.49, 135.37, 134.60, 132.17, 130.39, 129.95, 129.85, 128.18, 127.19, 127.02, 126.67, 126.51, 126.02, 120.05, 52.12, 27.28, 18.45. Anal. calcd. For C27H24N6O2S: C, 65.30; H, 4.87; N, 16.92; S, 4.46. Found: C, 65.12; H, 4.69; N, 17.11; S, 4.25; MS (70 eV): m/z = 496 (M+).


M.p. = 221–223 °C; IR (KBr): υ = 3175, 3134, 3091, 1672, 1606, 1245 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.67 (s, 1H), 8.18 (s, 1H), 8.10 (d, J = 7.9 Hz, 1H), 7.79–7.70 (m, 2H), 7.61–7.39 (m, 9H), 7.15 (d, J = 8.3 Hz, 1H), 5.31 (s, 2H), 4.50 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 165.09, 161.19, 157.12, 147.69, 140.26, 136.19, 135.38, 134.61, 133.65, 131.11, 130.43, 129.99, 129.88, 129.74, 127.02, 126.74, 126.53, 123.97, 120.07, 119.15, 118.06, 52.67, 27.31. Anal. calcd. For C25H19ClN6O2S: C, 59.70; H, 3.81; N, 16.71; S, 6.37. Found: C, 59.92; H, 4.01; N, 16.53; S, 6.20; MS (70 eV): m/z = 502 (M+).


M.p. = 185–187 °C; IR (KBr): υ = 3173, 3131, 3087, 1669, 1602, 1244 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.57 (s, 1H), 8.12 (s, 1H), 8.08 (d, J = 7.8 Hz, 1H), 7.84 (t, J = 7.7 Hz, 1H), 7.71 (d, J = 8.1 Hz, 1H), 7.60–7.40 (m, 10H), 5.27 (s, 2H), 4.47 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 164.82, 161.16, 157.11, 147.67, 138.19, 136.16, 135.37, 132.18, 130.40, 129.96, 129.86, 127.01, 126.71, 126.51, 126.10, 125.56, 121.56, 120.05, 115.83, 52.64, 27.27. Anal. calcd. For C25H19BrN6O2S: C, 54.85; H, 3.50; N, 15.35; S, 5.86. Found: C, 55.02; H, 3.74; N, 15.59; S, 6.01; MS (70 eV): m/z = 546 (M+).


M.p. = 231–233 °C; IR (KBr): υ = 3172, 3132, 3089, 1670, 1603, 1244 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 11.04 (s, 1H), 8.28–8.11 (m, 3H), 8.07 (d, J = 7.8 Hz, 1H), 7.88–7.66 (m, 5H), 7.60–7.38 (m, 6H), 5.36 (s, 2H), 4.48 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 165.73, 161.15, 157.08, 147.66, 144.91, 142.99, 136.16, 135.36, 131.97, 130.40, 129.96, 129.85, 128.73, 127.00, 126.71, 126.50, 125.53, 120.03, 119.43, 52.78, 27.32; Anal. calcd. For C25H19N7O4S: C, 58.47; H, 3.73; N, 19.09; S, 6.24. Found: C, 58.27; H, 3.66; N, 18.88; S, 6.06; MS (70 eV): m/z = 513 (M+).


M.p. = 224–225 °C; IR (KBr): υ = 3167, 3127, 3086, 1665, 1602, 1241 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.44 (s, 1H), 8.15 (s, 1H), 8.08 (d, J = 7.8 Hz, 1H), 7.83 (t, J = 7.8 Hz, 1H), 7.71 (d, J = 8.1 Hz, 1H), 7.59–7.49 (m, 5H), 7.50–7.40 (m, 3H), 7.30 (t, J = 7.8 Hz, 2H), 7.06 (t, J = 7.4 Hz, 1H), 5.27 (s, 2H), 4.48 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 164.57, 161.17, 157.10, 147.67, 138.82, 136.16, 135.37, 130.40, 129.96, 129.86, 129.35, 127.00, 126.71, 126.50, 124.20, 120.04, 119.60, 52.67, 27.29; Anal. calcd. For C25H20N6O2S: C, 64.09; H, 4.30; N, 17.94; S, 6.84. Found: C, 63.90; H, 4.51; N, 17.81; S, 7.03; MS (70 eV): m/z = 468 (M+).


M.p. = 219–221 °C; IR (KBr): υ = 3172, 3128, 3086, 1667, 1602, 1241 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 9.72 (s, 1H), 8.12 (s, 1H), 7.82 (t, J = 7.7 Hz, 1H), 7.67 (d, J = 8.1 Hz, 1H), 7.48 (t, J = 7.5 Hz, 1H), 7.34–7.18 (m, 6H), 7.04 (q, J = 5.0 Hz, 3H), 5.31 (s, 2H), 5.29 (s, 2H), 4.59 (s, 2H), 2.09 (s, 6H); 13C NMR (126 MHz, DMSO-d6) δ 164.39, 161.37, 156.70, 147.26, 136.00, 135.47, 135.39, 134.59, 130.28, 129.04, 128.17, 127.85, 127.18, 127.13, 127.06, 126.63, 126.11, 119.43, 119.20, 52.13, 47.22, 27.06, 18.43. Anal. calcd. For C28H26N6O2S: C, 65.86; H, 5.13; N, 16.46; S, 6.28. Found: C, 65.63; H, 5.00; N, 16.31; S, 6.12; MS (70 eV): m/z = 510 (M+).


M.p. = 197–199 °C; IR (KBr): υ = 3174, 3132, 3091, 1670, 1604, 1243 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.56 (s, 1H), 8.14–8.09 (m, 2H), 7.83 (t, J = 7.3 Hz, 1H), 7.69 (d, J = 7.7 Hz, 1H), 7.55–7.45 (m, 5H), 7.30 (t, J = 8.0 Hz, 2H), 7.23 (dd, J = 14.0, 7.4 Hz, 3H), 5.30 (s, 2 ), 5.27 (s, 2H), 4.59 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 164.82, 161.38, 156.69, 147.27, 136.01, 135.40, 134.81, 133.70, 132.18, 130.15, 129.05, 127.86, 127.13, 127.05, 126.69, 126.66, 126.11, 121.55, 119.20, 52.64, 47.23, 27.00. Anal. calcd. For C26H21BrN6O2S: C, 55.62; H, 3.77; N, 14.97; S, 5.71. Found: C, 55.85; H, 3.47; N, 15.18; S, 5.56; MS (70 eV): m/z = 560 (M+).


M.p. = 212–214 °C; IR (KBr): υ = 3172, 3130, 3088, 1669, 1603, 1242 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 11.08 (s, 1H), 8.23 (d, J = 9.0 Hz, 2H), 8.17 (s, 1H), 8.12 (d, J = 7.9 Hz, 1H), 7.81 (dd, J = 11.4, 8.2 Hz, 3H), 7.69 (d, J = 8.2 Hz, 1H), 7.49 (t, J = 7.6 Hz, 1H), 7.28 (dt, J = 35.0, 7.5 Hz, 5H), 5.39 (s, 2H), 5.31 (s, 2H), 4.62 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 165.77, 161.38, 156.67, 147.27, 144.94, 143.00, 136.02, 135.37, 131.23, 129.06, 128.82, 127.87, 127.16, 127.05, 126.68, 126.63, 125.54, 119.43, 119.20, 52.78, 47.25, 27.06. Anal. calcd. For C26H21N7O4S: C, 59.19; H, 4.01; N, 18.59; S, 6.08. Found: C, 59.33; H, 3.89; N, 18.77; S, 5.91; MS (70 eV): m/z = 527 (M+).


M.p. = 224–225 °C; IR (KBr): υ = 3168, 3126, 3087, 1666, 1600, 1241 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.45 (s, 1H), 8.16 (s, 1H), 8.11 (d, J = 7.9 Hz, 1H), 7.80 (t, J = 7.7 Hz, 1H), 7.67 (d, J = 8.1 Hz, 1H), 7.56 (d, J = 8.0 Hz, 2H), 7.46 (t, J = 7.6 Hz, 1 H), 7.26 (dd, J = 31.9, 8.1 Hz, 8H), 7.06 (t, J = 7.4 Hz, 1H), 5.30 (s, 4H), 4.61 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 164.57, 161.37, 156.66, 147.26, 138.84, 136.01, 135.33, 129.33, 129.03, 128.81, 127.85, 127.17, 127.04, 126.66, 126.59, 126.23, 124.19, 119.63, 119.21, 52.71, 47.24, 27.10. Anal. calcd. For C26H22N6O2S: C, 64.71; H, 4.60; N, 17.42; S, 6.64. Found: C, 46.56; H, 4.82; N, 17.26; S, 6.86; MS (70 eV): m/z = 482 (M+).


M.p. = 238–239 °C; IR (KBr): υ = 3171, 3131, 3088, 1668, 1603, 1242 cm−1; 1H NMR (500 MHz, DMSO-d6) δ 10.66 (s, 1H), 8.20 (s, 1H), 8.12 (d, J = 7.8 Hz, 1H), 7.82 (t, J = 7.4 Hz, 1H), 7.76 (s, 1H), 7.69 (d, J = 8.1 Hz, 1H), 7.48 (t, J = 7.5 Hz, 1H), 7.42 (d, J = 8.1 Hz, 1H), 7.33 (dt, J = 18.5, 7.6 Hz, 4H), 7.24 (d, J = 7.6 Hz, 3H), 7.14 (d, J = 7.9 Hz, 1H), 5.32 (d, J = 13.3 Hz, 4H), 4.62 (s, 2H); 13C NMR (126 MHz, DMSO-d6) δ 165.01, 161.38, 156.60, 147.26, 140.24, 136.01, 135.34, 133.65, 131.07, 129.05, 127.86, 127.18, 127.05, 126.69, 126.63, 123.95, 119.22, 119.15, 118.04, 52.76, 47.25, 27.06. Anal. calcd. For C26H21ClN6O2S: C, 60.40; H, 4.09; N, 16.26; S, 6.20. Found: C, 60.23; H, 3.85; N, 16.05; S, 5.96; MS (70 eV): m/z = 516 (M+).

Availability of data and materials

The datasets used and/or analysed during the current study available from the corresponding author on reasonable request.


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AS did the work and characterized the products. AS, SM, and MM analyzed the results. AS and MM prepared tha manuscript. MM leaded the work.

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Images of 1H NMR and 13C NMR of the new synthesized compounds are available in the Supporting Information.

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Sherafati, A., Moradi, S. & Mahdavi, M. Efficient synthesis of 3-alkyl-2-(-1H-1,2,3-triazolyl)methyl)thio)-2,3-dihydroquinazolin-4(1H)-one derivative via multistep synthesis approach by novel Cu@Py-Oxa@SPION catalyst. BMC Chemistry 17, 154 (2023).

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