A Cu-catalyzed Sonogashira-type coupling of 3-(2-bromophenyl)pyrazoles with terminal alkynes combined with a subsequent electrophilic cyclization in the same pot was developed to afford pyrazolo[5,1-a]isoquinolines. The transformation proceeds without the necessity of using Pd or ligands, while an Ag additive is beneficial.
开发了
铜催化的 3-(2-
溴苯基)
吡唑与末端
炔烃的 Sonogashira 型偶联以及随后在同一罐中的亲电环化,以得到
吡唑并[5,1-a]
异喹啉。该转化无需使用
钯或
配体即可进行,而
银添加剂是有益的。