A Regioselective Approach to Trisubstituted Pyrazoles via Palladium-Catalyzed Oxidative Sonogashira-Carbonylation of Arylhydrazines
作者:Yongliang Tu、Zhenming Zhang、Tao Wang、Jiamei Ke、Junfeng Zhao
DOI:10.1021/acs.orglett.7b01447
日期:2017.7.7
A palladium-catalyzed oxidative carbonylation of arylhydrazines and alkynes with balloon pressure CO/O2 to afford trisubstituted pyrazoles in a one-pot manner has been developed. The formation of trisubstituted pyrazoles involves a sequential C–N bond cleavage, carbonylation, Sonogashira coupling, Michael addition, and intramolecular condensation cyclization tandem process. An unprecedented oxidative
已经开发了用球罐压力CO / O 2进行钯催化的芳基肼和炔烃的氧化羰基化反应,以一锅法得到三取代的吡唑。三取代吡唑的形成涉及连续的C–N键断裂,羰基化,Sonogashira偶联,迈克尔加成和分子内缩合环化串联过程。芳基肼的空前的氧化Sonogashira-羰基化反应在如此简便的吡唑方法中起着关键作用。