New β-amino thiols as efficient catalysts for highly enantioselective alkenylzinc addition to aldehydes
作者:Shi-Liang Tseng、Teng-Kuei Yang
DOI:10.1016/j.tetasy.2004.11.093
日期:2005.2
A series of new optically active beta-amino thiols and thiolacetates prepared from the simple natural amino acid, (S)-(-)-valine, were found to be effective catalysts for the enantioselective addition of alkenylzinc to alclehydes and thereby providing an efficient route for chiral (E)-allylic alcohols with ees of up to >99% in the presence of 7a (1 mol %). (C) 2005 Published by Elsevier Ltd.
The application of chiral amino thiols as catalysts in the enantioselective addition of diethylzinc to aldehydes
作者:Shi-Liang Tseng、Teng-Kuei Yang
DOI:10.1016/j.tetasy.2004.08.009
日期:2004.11
Starting from (S)-(−)-valine, a series of new chiral amino thiol and corresponding thioacetate ligands were prepared in an efficient manner and applied in the asymmetric diethylzincaddition to aldehydes with excellent enantioselectivity as high as 99% ee and with a catalytic loading as little as 0.02 mol % of the amino thiol 11c.