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Table 3 Synthesis of spiro[indoline-3,4′- pyrano[2,3-c]pyrazole] derivatives using Fe3O4@l-arginine under solvent-free conditions

From: Green synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazoles] using Fe3O4@l-arginine as a robust and reusable catalyst

Entry Product Yield (%)a M.p.  °C Lit. M.p.  °C
1 5{1,1,1,1} 96 286–288 285–286 [18]
2 5{1,1,2,1} 91 297–298 297–298 [18]
3 5{1,1,3,1} 95 283–285 282–283 [18]
4 5{2,1,1,1} 90 225–227 227–229 [18]
5 5{1,2,3,1} 91 257–259 256–257 [18]
6 5{1,2,1,1} 90 282–284 280–281 [18]
7 5{1,2,1,2} 87 240–242 242–243 [18]
8 5{1,2,3,2} 89 256–258 257–259 [18]
9 5{1,2,2,2} 85 266–268 265–267 [18]
10 5{1,1,4,1} 94 278–280 279–281 [18]
11 5{1,2,4,1} 86 246–248 247–249 [18]
12 5{1,2,4,2} 87 262–264 260–263 [18]
13 5{2,1,4,1} 89 220–222 222–224 [18]
14 5{2,1,3,2} 92 212–214 –b
15 5{2,1,2,2} 90 279–281 –b
16 5{2,1,4,2} 97 198–200 –b
  1. aIsolated yield
  2. bNew Products
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BMC Chemistry

ISSN: 2661-801X

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