A Short Synthetic Approach to Enantiomerically Pure (-)-Anisomycin
摘要:
A convenient enantiomerically pure route to an antibiotic, natural (-)-anisomycin has been developed in a short number of steps by featuring the stereocontrolled elaboration of the functionalized homochiral lactam derived from 2,3,5-tri-O-benzyl-beta-L-arabinofuranose involving no separation of stereoisomers through the entire sequence.
Syntheses with Partially Benzylated Sugars. II.1 The Anomeric 1-O-Benzoyl-L-arabinopyranoses and 1-O-Benzoyl-L-arabinofuranoses and Their Tendencies to Undergo Acyl Migration
Chiral Pyrroline-Based Ugi-Three-Component Reactions Are under Kinetic Control
作者:Erwin R. van Rijssel、Theodorus P. M. Goumans、Gerrit Lodder、Herman S. Overkleeft、Gijsbert A. van der Marel、Jeroen D. C. Codée
DOI:10.1021/ol4012053
日期:2013.6.21
is often assumed that the stereochemistry in Ugi multicomponent reactions is determined in the final Mumm rearrangement step, experimental and computational evidence that Ugi reactions on hydroxylated pyrrolines proceed under kinetic control is reported. The stereochemistry of the reaction is established with the addition of the isocyanide to the intermediate iminium ion, whose conformation is determined