Catalyst-Free [4+2] Cycloaddition of Ynamides with 2-Halomethyl Phenols To Construct 2-Amino-4<i>H</i>-Chromenes and α-Halo Enamides Simultaneously
作者:Hao Wen、Weibo Yan、Ping Chen、Yu Li、Yu Tang
DOI:10.1021/acs.joc.0c01258
日期:2020.10.16
We report the development of a facile protocol for the [4+2] cycloaddition of ynamides and 2-halomethyl phenols to afford the corresponding 2-amino-4H-chromenes and α-halo enamides under catalyst-free conditions. The reaction proceeds under mild conditions and exhibits good tolerance toward various functional groups and generates high yields. The plausible mechanism involves the formation of an active