Ionic Liquid [HNMP][HSO<sub>4</sub>] Promoted One Pot Synthesis of 1,4- Dihydropyridine Derivatives at Room Temperature
作者:Gopinath D. Shirole、Ramesh A. Mokal、Sharad N. Shelke
DOI:10.2174/1570178614666170614085815
日期:2017.8.22
a diversity of other functional groups. Conclusion: In summary, we developed a new protocol for the synthesis of various diethyl 1,4- dihydro-2,6-dimethyl-4-(3-aryl-1-phenyl-1H-pyrazol-4-yl)pyridine-3,5-dicarboxylate derivatives using acidicionicliquid [HNMP] [HSO4] as a highlyefficientcatalyst. The DHPs 4a-j were obtained by simply stirring at room temperature for appropriate time. A significant
An efficient approach to 1,4‐dihydropyridines containing novel substituted pyrazole is achieved via three‐component reaction of pyrazolyl aldehyde, β‐ketoester, and ammonium acetate in one‐pot under sulfamic acid catalysis.
Pumice-based sulfonic acid: a sustainable and recyclable acidic catalyst for one-pot synthesis of pyrazole anchored 1,4-dihydropyridine derivatives at room temperature
for the synthesis of pyrazole anchored 1,4-dihydropyridine analogs using pumice-based sulfonic acid (pumice@SO3H) as a recyclablesolidacidcatalyst under simple stirring at room temperature. The present protocol proceeded smoothly with 1,3-diaryl pyrazole-4-carbaldehydes, ethyl acetoacetate, and NH4OAc in ethanol as a solvent with excellent yield. The pumice-based sulfonic acidcatalyst is easily