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.