One-pot synthesis of highly functionalized morphans from C-glycosides
作者:Wei Zou、Kannan Vembaiyan、Milan Bhasin、Dean T. Williams
DOI:10.1016/j.carres.2009.08.028
日期:2009.11
Highly functionalized morphan derivatives were synthesized from nitroalkene 2'-(oxoalkyl)-C-glycosides by a tandem reaction that created three (two C-N and one C-C) new bonds and four stereogenic centers in a one-pot procedure under very mild conditions without the use of expensive reagents. The transformation was achieved from a beta-elimination/Michael addition cascade, followed by Michael addition of the amine and intramolecular enamination. In the presence of sodium cyanoborohydride the iminium intermediate was reduced in situ to afford the desired morphans. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
Triazole-fused sugars from nitroalkene-containing C-glycosides by a tandem 1,3-dipolar cycloaddition and intramolecular Michael addition
作者:Wei Zou、Milan Bhasin、Kannan Vembaiyan、Dean T. Williams
DOI:10.1016/j.carres.2009.03.007
日期:2009.5
A syntheticmethod to triazole-fused sugars by treatment of nitroalkene-containing C-glycosides with sodium azide is described. Initial experiments conducted at room temperature gave only the 1,3-dipolarcycloaddition products. However, at elevated reaction temperature the tandem beta-elimination/cycloaddition/Michael addition yielded 1,5-disubstituted triazole-fused sugars.