Lewis Acid Catalyzed Electrophilic Aminomethyloxygenative Cyclization of Alkynols with <i>N</i>,<i>O</i>-Aminals
作者:Anrong Chen、Houjian Yu、Jiaqi Yan、Hanmin Huang
DOI:10.1021/acs.orglett.9b04630
日期:2020.1.17
Lewis acid enables the electrophilic carbooxygenative cyclization of alkynols with N,O-aminals. The new process proceeds efficiently under very mild conditions via a pathway that is opposite to classical carbo-metalation. These reactions exhibit broad substrate generality and functional group compatibility, leading to a wide variety of 5-8-membered oxacycles bearing diverse functional groups. The cyclization
路易斯酸能使炔醇与N,O-缩醛胺进行亲电子的碳氧环化反应。新工艺在非常温和的条件下通过与经典碳金属化相反的途径高效进行。这些反应表现出广泛的底物通用性和官能团相容性,从而导致各种带有不同官能团的5-8元氧杂环。环化产物可通过简单的官能团转化进行精制,以生成合成上有用的氧杂环。