Synthesis of α-C-glycosides via tandem Tebbe methylenation and Claisen rearrangement
作者:H.Yasmin Godage、Antony J. Fairbanks
DOI:10.1016/s0040-4039(03)00710-x
日期:2003.4
A variety of alpha-C-glycosides may be accessed in an entirely stercoselective fashion from 3-OH glycal esters, by way of the tandem reaction sequence of Tebbe methylenation and Claisen rearrangement. In contrast with previous studies in the corresponding beta-series, careful control of conditions for Claisen rearrangement is required in order to avoid loss of integrity of anomeric stereochemistry; thermal rearrangements are best carried out in xylene in a sealed tube. (C) 2003 Elsevier Science Ltd. All rights reserved.
Stereoselective synthesis of C-glycosides from carboxylic acids: the tandem Tebbe–Claisen approach
作者:H. Yasmin Godage、David J. Chambers、Graham R. Evans、Antony J. Fairbanks
DOI:10.1039/b306675b
日期:——
entirely stereoselective fashion from esters derived from the reaction of carboxylic acids and 3-hydroxy glycals, by way of a tandem reaction sequence of Tebbe methylenation and Claisenrearrangement. Though of wide scope, for example allowing the synthesis of 1-6 linked C-disaccharides, the methodology does not currently allow the synthesis of C-glycosyl alpha-amino acids.