Double asymmetric induction as a mechanistic probe: the doubly diastereoselective conjugate addition of enantiopure lithium amides to enantiopure α,β-unsaturated esters and enantiopure α,β-unsaturated hydroxamates
作者:Stephen G. Davies、James A. Lee、Paul M. Roberts、James E. Thomson、Jingda Yin
DOI:10.1016/j.tet.2011.05.102
日期:2011.8
diastereoselective conjugateaddition of the antipodes of lithium N-benzyl-N-(α-methylbenzyl)amide to a range of enantiopure α,β-unsaturated esters [derived from Corey’s 8-phenylmenthol chiral auxiliary] and enantiopure α,β-unsaturated hydroxamates [derived from our ‘chiral Weinreb amide’ auxiliary (S)-N-1-(1′-naphthyl)ethyl-O-tert-butylhydroxylamine] has been used as a mechanisticprobe to determine the
Doubly diastereoselective conjugate addition of enantiopure lithium amides to enantiopure N-enoyl oxazolidin-2-ones: a mechanistic probe
作者:Stephen G. Davies、Ai M. Fletcher、Gesine J. Hermann、Giovanna Poce、Paul M. Roberts、Andrew D. Smith、Miles J. Sweet、James E. Thomson
DOI:10.1016/j.tetasy.2010.03.033
日期:2010.7
diastereoselective conjugateaddition of the antipodes of lithium N-benzyl-N-(α-methylbenzyl)amide to a range of enantiopure N-enoyl oxazolidin-2-ones has been used as a mechanistic probe to determine that the reactive conformation is the anti-s-cis form. The β-amino carbonyl products resulting from these conjugateaddition reactions are useful templates for further elaboration into an α,β,α-pseudotripeptide