Gold(I)-Catalyzed Enantioselective Intramolecular Dehydrative Amination of Allylic Alcohols with Carbamates
作者:Paramita Mukherjee、Ross A. Widenhoefer
DOI:10.1002/anie.201107877
日期:2012.2.6
Aliphatic nitrogen heterocycles—either five‐ or six‐membered—are formed in high yield and with up to 94 % ee when a 1:2 mixture of [(S)‐2](AuCl)2 and AgClO4 is used as the catalyst for the title reaction.
A Brønsted‐acid‐catalyzed intramolecular enantioselective SN2′ reaction was developed utilizing trichloroacetimidate as a leavinggroup. The findings indicated that dual activation of the substrates is operative. This metal‐free allylic alkylation allows highly enantioselective access to 2‐vinylpyrrolidines bearing various substituents.
利用三氯乙酰亚氨酸酯作为离去基团开发了布朗斯台德酸催化的分子内对映选择性S N 2'反应。该发现表明底物的双重激活是有效的。这种无金属的烯丙基烷基化作用使对带有各种取代基的2-乙烯基吡咯烷酮具有高度对映选择性。