Oxazinanones as chiral auxiliaries: synthesis and evaluation in enolate alkylations and aldol reactions
作者:Stephen G. Davies、A. Christopher Garner、Paul M. Roberts、Andrew D. Smith、Miles J. Sweet、James E. Thomson
DOI:10.1039/b604073j
日期:——
Homochiral beta-amino esters (prepared on multigram scale by lithium amide conjugate addition) are readily transformed into oxazinanones. N-acyl derivatives of oxazinanones undergo stereoselective enolate alkylation reactions, with higher stereoselectivities observed for the enolate alkylation of (R)-N-propanoyl-4-iso-propyl-6,6-dimethyl-oxazinan-2-one than the corresponding Evans oxazolidin-2-one