A facile synthesis of 6-amino-2H, 4H-pyrano[2,3-F]pyrazole-5-carbonitriles in deep eutectic solvent
A facile synthesis of 6-amino-2H, 4H-pyrano[2,3-F]pyrazole-5-carbonitriles in deep eutectic solvent作者机构:Department of Chemistry Dr. Babasaheb Ambedkar Marathwada University Aurangabad 431004 Maharashtra India
出 版 物:《Chinese Chemical Letters》 (中国化学快报(英文版))
年 卷 期:2016年第27卷第3期
页 面:370-374页
核心收录:
学科分类:081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学]
基 金:Dr. Babasaheb Ambedkar Marathwada and University
主 题:Choline chloride Cyclocondensation DES One pot Urea Pyranopyrazoles
摘 要:A convenient synthesis of 6-amino-2H,4H-pyrano[2,3-F]pyrazole-5-carbonitriles has been accomplished by one pot four-component cyclocondensation of aromatic aldehydes(1a-o) malanonitrile(2), ethyl acetoacetate(3), and hydrazine hydrate(4) in freshly prepared deep eutectic solvent, DES(choline chloride:urea). This protocol has afforded corresponding pyrano[2,3-F]pyrazoles in shorter reaction time with high yields, and it avoids the use of typical toxic catalysts and solvents.