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Table 3 The comparison of catalyst-free protocol with other methods for synthesis of 5a
figure d

From: Catalyst-free synthesis of tetrahydrodipyrazolopyridines via an one-pot tandem and green pseudo-six-component reaction in water

Entry Catalyst Conditions Time (min)/yielda (%) [Reference]
1 Fe3O4/KCC1/IL/HPWMNPs (0.0001 mg) H2O/r.t 30/96 [24]
2 Nano-CdZr4(PO4)6 (0.6 mol%) EtOH/reflux 43/88 [25]
3 Nano-Fe3O4@SiO2-SO3H (0.004 g) EtOH/MW 20/90 [23]
4 FeNi3-ILs MNPs (0.002 g) EtOH/reflux 48/86 [21]
5 Nano-CuCr2O4 (4 mol%) EtOH/25 °C 50/90 [26]
6 Nano-ovalbumin (0.05 g) H2O/55 °C 45/93 [20]
7 M (II)/Schiff base@MWCNT-Fe3O4/SiO2 (0.02 g) –/r.t 90/85 [27]
8 Pseudopolymeric magnetic nanoparticles (10 mg) EtOH/r.t 10–180/45–92 [13]
9 KCC-1-NH2-DPA (0.1 g) EtOH, reflux 30/95 [14]
10 CuFe2O4@HNTs (5 mg) EtOH, r.t 20/90–96 [15]
11 acetic acid AcOH/reflux 300/90 [16]
12 carbonaceous material (CSO3H) (10 mg) H2O/60 °C 360/86 [17]
13 Catalyst-free H2O/r.t 45/98 [This work]
  1. aIsolated yields