An efficient, environmentally benign and unprecedented synthesis of various α-sulfenylated amides/esters has been developed under oxygen atmosphere. The reaction shows good functional group tolerance and excellent chemo/regioselectivity. All the desired products were obtained in moderate to excellent yields, even on the gram scale. Practically, the related α-thiol Weinreb amide can be readily transferred
The regioselective opening reaction of 2,3-epoxyanudes with Various nucleophiles offers a variety of beta-hydroxyamides with diverse synthetic utility depending on the introduced nucleophile. Due to the exclusive stereoselectivity in the formation of trans epoxyamides in reactions of aldehydes with stabilized sulfur ylides, We studied the isomerization of trans epoxyamides into the cis isomers with the objective of obtaining the corresponding syn opening products, which together with the anti isomers represent a variety of enantiomerically Pure building blocks. (C) 2004 Elsevier Ltd. All rights reserved.
Fluorinations of ?-Seleno Carboxylic Acid Derivatives with Hypervalent (Difluoroiodo)toluene
作者:Maria A. Arrica、Thomas Wirth
DOI:10.1002/ejoc.200400659
日期:2005.1
A very efficient synthesis of (difluoroiodo)toluene avoiding the use of elemental chlorine and elemental fluorine is described. We have fluorinated a series of α-acceptor substituted selenides using (difluoroiodo)toluene.The reactions are usually very clean and under the reaction conditions no further oxidized products are observed.