A novel one pot four-component reaction for the efficient synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole]-3′-carboxylate and trifluoromethylated spiro[indole-3,4′-pyrano[2,3-c]pyrazole] derivatives using recyclable PEG-400
作者:K. Karnakar、K. Ramesh、K. Harsha Vardhan Reddy、B. S. P. Anil Kumar、Jagadeesh Babu Nanubonula、Y. V. D. Nageswar
DOI:10.1039/c5nj01448d
日期:——
efficient synthetic protocol has been developed for the synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole]-3′-carboxylate and trifluoromethylated spiro[indole-3,4′-pyrano[2,3-c]pyrazole] derivatives via a one pot, four-component reaction using recyclable polyethylene glycol (PEG-400). This new protocol produces novel spiro pyranopyrazole derivatives in good to excellent yields, with operational
已开发出一种新颖,简单,有效的合成方案,用于合成螺[吲哚啉-3,4'-吡喃并[2,3- c ]吡唑] -3'-羧酸盐和三氟甲基化螺[吲哚-3,4'-通过使用可回收的聚乙二醇(PEG-400)进行一锅四组分反应,生成吡喃并[2,3- c ]吡唑]衍生物。该新方案以良好的产率和优异的产率生产新颖的螺并吡喃并吡唑衍生物,且操作简便且可回收PEG-400。该方法的显着特点是高收率,简便的后处理工艺以及避免有毒催化剂和有害溶剂的绿色方法。