Dimethylzinc-Mediated, Oxidatively Promoted Reformatsky Reaction of Ethyl Iodoacetate with Aldehydes and Ketones
作者:Pier Giorgio Cozzi、Alessandro Mignogna、Paola Vicennati
DOI:10.1002/adsc.200700572
日期:2008.5.5
A practical and general Reformatskyreaction, promoted by oxidants and mediated by dimethylzinc, is described. The reaction is fast and runs at 0 °C with aldehydes and ketones, under mild reaction conditions. Preliminary results obtained for the enantioselective version show that inexpensive chiral amino alcohols could be used in the challenging formation of enantioenriched quaternary stereogenic centers
Copper-promoted enantioselective Reformatsky-type reaction with ketones
作者:Fides Benfatti、Pier Giorgio Cozzi
DOI:10.1016/j.tetasy.2010.04.058
日期:2010.6
Controlled living polymerization of a broad range of monomers is a radical process known as ATRP (atom transfer radical polymerization) and is mediated by a variety of metals. A complex of copper has been found to be the most efficient catalyst, with a copper(I)/copper(II) catalytic cycle. The radical, enantioselective catalytic Reformatsky reaction mediated by Me2Zn can be efficiently promoted by copper(I) complexes avoiding the use of other promoters such as air and oxidant, giving more reproducible and affordable conditions. The CuCN-mediated enantioselective addition of ethyliodoacetate to functionalized ketones is described in this paper. (C) 2010 Elsevier Ltd. All rights reserved.