Gold-Catalyzed Oxidative Cyclizations of {<i>o</i>-(Alkynyl)phenyl propargyl} Silyl Ether Derivatives Involving 1,2-Enynyl Migration: Synthesis of Functionalized 1<i>H</i>-Isochromenes and 2<i>H</i>-Pyrans
作者:Jidong Zhao、Wei Xu、Xin Xie、Ning Sun、Xiangdong Li、Yuanhong Liu
DOI:10.1021/acs.orglett.8b02380
日期:2018.9.7
A new and convenient strategy for the synthesis of functionalized 1H-isochromene and 2H-pyran derivatives based on gold-catalyzed oxidative cyclizations of o-(alkynyl)phenyl propargyl ether derivatives has been developed. The reaction proceeds via gold-catalyzed highly regioselective oxidation, followed by 1,2-migration of an enynyl group and nucleophlic addition. Isocoumarins were also constructed
基于金催化的邻-(炔基)苯基炔丙基醚衍生物的氧化环化反应,开发了一种新的方便的合成功能化的1 H-异戊二烯和2 H-吡喃衍生物的策略。该反应通过金催化的高度区域选择性氧化进行,然后进行烯键基的1,2-迁移和核苷加成。还通过氧化裂解所获得的1 H-异色酮的环外双键来构建异香豆素。