Meyers’ bicyclic lactam formation under mild and highly stereoselective conditions
作者:Maël Penhoat、Stephane Leleu、Georges Dupas、Cyril Papamicaël、Francis Marsais、Vincent Levacher
DOI:10.1016/j.tetlet.2005.09.154
日期:2005.11
New and mild conditions to prepare chiral bicyclic lactams in high yields and high diastereoselectivities are reported herein. This approach based on the activation of the carboxylic acid by means of Mukaiyama’s reagent is an excellent alternative to Meyers’ dehydrating conditions and provide the main advantage to work at lower temperature (40 °C). Higher diastereoselectivity was obtained with 5,7-bicyclic
本文报道了以高产率和高非对映选择性制备手性双环内酰胺的新的温和条件。这种基于Mukaiyama试剂对羧酸进行活化的方法是Meyers脱水条件的极佳替代方法,并提供了在较低温度(40°C)下工作的主要优势。用5,7-双环内酰胺获得更高的非对映选择性(标准脱水条件下,de = 82%,而不是44%)。