Memory of chirality in the stereoselective synthesis of β-lactams: importance of the starting amino acid derivative
作者:Ma̱ Angeles Bonache、Guillermo Gerona-Navarro、Carlos Garcı́a-Aparicio、Miriam Alı́as、Mercedes Martı́n-Martı́nez、Ma̱ Teresa Garcı́a-López、Pilar López、Carlos Cativiela、Rosario González-Muñiz
DOI:10.1016/s0957-4166(03)00398-7
日期:2003.8
The enantioselectivity of the base-promoted cyclization of N-alkyl-N-chloroacetyl amino acid derivatives to beta-lactams is dependent on the substituents on the starting material. While Bu-t esters are preferred over Me esters, and N-Bzl-, N-Pmb, N-Nph and N-Mom groups gave similar e.e. values, only amino acid derivatives with branched side-chains at the gamma-position were able to show a good memory of chirality. (C) 2003 Elsevier Ltd. All rights reserved.