Synergetic effects of naturally sourced metal oxides in organic synthesis: a greener approach for the synthesis of pyrano[2,3-c]pyrazoles and pyrazolyl-4H-chromenes
作者:Sachin K. Shinde、Megha U. Patil、Shashikant A. Damate、Suresh S. Patil
DOI:10.1007/s11164-017-3197-8
日期:2018.3
A clean and more economic protocol for the synthesis of pyrano[2,3-c]pyrazoles and pyrazolyl-4H-chromenes has been carried out using bael fruit ash (BFA) as a non-conventional natural catalyst in aqueous condition at ambient temperature. The catalyst was obtained from renewable resources by simple thermal treatment to dry rind of Aegle marmelos (Bael) fruit and formation of its active phase was confirmed by AAS, DSC-TGA, XRD, FT-IR, and SEM techniques. The BFA catalyst was found to be a green, highly active, easily biodegradable, and recyclable without loss of activity after the fifth run. The methodology provides an alternative platform to the conventional catalyzed process.
一种清洁且更经济的合成吡喔[2,3-c]吡唑和吡唑基-4H-色烯的协议已通过使用番木瓜果灰(BFA)作为非常规天然催化剂,在常温下的水相条件下进行。该催化剂由可再生资源制得,通过简单的热处理干燥Aegle marmelos(番木瓜)果皮,活性相的形成通过AAS、DSC-TGA、XRD、FT-IR和SEM技术得到了确认。实验结果表明,BFA催化剂是一种绿色、高活性、易降解且可回收的催化剂,在第五次反应后未出现活性丧失。这种方法为传统催化过程提供了替代平台。