On the Origins of Diastereoselectivity in the Alkylation of Enolates Derived from <i>N</i>-1-(1′-Naphthyl)ethyl-<i>O</i>-<i>tert</i>-butylhydroxamates: Chiral Weinreb Amide Equivalents
作者:Stephen G. Davies、Christopher J. Goodwin、David Hepworth、Paul M. Roberts、James E. Thomson
DOI:10.1021/jo902499s
日期:2010.2.19
The stereochemical outcome observed upon alkylation of enolates derived from N-1-(1′-naphthyl)ethyl-O-tert-butylhydroxamates (chiral Weinreb amide equivalents) may be rationalized by a chiral relay mechanism. Deprotonation with KHMDS leads to a nonchelated (Z)-enolate in which the oxygen atoms adopt an anti-periplanar conformation. The configuration of the N-1-(1′-naphthyl)ethyl group dictates the