Diastereoselective [2+2+1] Hydrative Annulation of Phenol‐Linked 1,6‐Enynes with Acetylenes Through Rhodium Catalysis: A Rapid Access to Cyclopenta[b]benzofuranols
作者:Attunuri Nagireddy、Dattatri、Jagadeesh Babu Nanubolu、Maddi Sridhar Reddy
DOI:10.1002/chem.202102930
日期:2021.12.15
A unique [2+2+1] annulation of phenol-linked 1,6-enynes with terminal alkynes intercepted by hydration is uncovered using catalytic cationic Rh(I) for a facile and modular assembly of cyclopenta[b]benzofuranols with two consecutive quaternary stereocenters. The reaction is proposed to go through a sequence of 5-membered rhoda-cycle formation, regioselective acetylene insertion, 1,5 H-shift, substrate
使用催化阳离子 Rh(I) 发现了一个独特的 [2+2+1]酚连接的 1,6-烯炔与末端炔烃的环化,以方便和模块化组装具有两个连续季铵盐的环戊 [b] 苯并呋喃醇立体中心。建议该反应经历一系列 5 元罗达环形成、区域选择性乙炔插入、1,5 H 位移、底物控制的水分子立体选择性加成,然后是 1,2-铑迁移,得到收缩的罗达循环 D和还原消除。