Highly Selective Synthesis of Acetylenic Alcohols Promoted by Metallic Dysprosium in the Presence of Mercuric Chloride
作者:Zhiming Li、Yu Jia、Jingyao Zhou
DOI:10.1080/00397910008087415
日期:2000.7
Abstract Promoted by metallic dysprosium, carbonyl compounds react smoothly with propargyl bromide to afford the corresponding homopropargylic alcohols in good to excellent yields without observation of allenic alcohols. In addition, this reaction is regioselective and chemoselective.
The acid-catalyzed reaction of epoxy alkyne involves an epoxide ring-opening attacked by π-alkyne, leading to a semipinacol-type rearrangement. In this process, a type of carbon−carbon 3,3-migration of the alkyne system has been discovered, which is promoted both by epoxide inducing and hydroxide promoting. This transformation enables the fast synthesis of allenes in mild conditions.
Synthesis of Azepane Derivatives via Formal 1,3-Migration of Hydroxy and Acyloxy Groups and Selective Annulation
作者:Zijuan Feng、Hongjian Jiao、Zihang Ye、Jie Ye、Ze-Feng Xu、Shengguo Duan、Chuan-Ying Li
DOI:10.1021/acs.orglett.2c01646
日期:2022.7.29
Formal 1,3-migration of hydroxy and acyloxy groups initiated by α-imino rhodium carbene was achieved, and the following selective annulations of the corresponding zwitterions could efficiently afford azepane derivatives. Benefiting from a time-saving procedure as well as a good functional group tolerance, this unique migration–annulation protocol could provide an efficient tool for synthesizing seven-membered