An efficient and green synthesis of novel highly functionalized nitrogen-fused pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine derivatives using recyclable choline hydroxide
作者:Suresh Kumar Krishnammagari、Yeon Tae Jeong
DOI:10.1007/s11164-018-3558-y
日期:2018.12
has been found to be a green and efficient basic ionic liquid catalyst for the synthesis of highly functionalized pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine derivatives through the reaction of a series of α,β-unsaturated ketones with 1H-pyrazolo[3,4-b]pyridin-3-amine under neat conditions. A series of α,β-unsaturated ketones with different substituted functional groups efficiently were converted to their
摘要 已发现胆碱氢氧化物(ChOH)是一种绿色高效的碱性离子液体催化剂,可通过以下反应合成高度官能化的吡啶并[2',3':3,4]吡唑并[1,5- a ]嘧啶衍生物。在纯条件下用1 H-吡唑并[3,4- b ]吡啶-3-胺形成的一系列α,β-不饱和酮。一系列α,β高效地将具有不同取代官能团的不饱和酮转化为相应的产物,分离产率高至优异,反应可轻松放大至几克。本发明对环境无害且可重复使用的ChOH催化剂具有几个优点,例如反应时间更短,官能团耐受性范围广以及通过简单的实验和后处理程序即可获得高产率的产物。 图形概要 该方法的主要特点是绿色反应,操作简便,可重复使用,易操作性强,ChOH效率高。