give a diastereomeric ester mixture. Only iminolactones of l-amino acids were formed after cyclization of (1S,2S,5S)-2-hydroxypinan-3-one, and correspondingly only d-amino acid iminolactones were formed after reaction with (1R,2R,5R)-2-hydroxypinan-3-one. The protocol thus enables inversion of the absoluteconfiguration of amino acids. Some members of the prepared library of iminolactones displayed significant
Efficient asymmetric synthesis of amino acids through hydrogenation of the didehydroamino acid residue in cyclic imino-ester derivatives
作者:Carlos Cativiela、Maria D. Diaz-de-Villegas、José A. Galvez
DOI:10.1016/s0957-4166(00)80263-3
日期:1992.4
The trisubstituted olefinic bond of chiral cyclic α,β-didehydroamino acidderivatives was hydrogenated in the presence of Pd/C with >95% diastereoface discrimination to give, after hydrolysis, the corresponding S-amino acids. The reduction of the double bond with L-selectride® does not change the orientation of diastereoface discrimination and the diastereoselectivity is still high.