A convenient method for the enantiomeric separation of α-amino acid esters as benzophenone imine Schiff base derivatives
作者:Hu Huang、Wen Jun Xu、Jing-Yu Jin、Joon Hee Hong、Hyun-Jae Shin、Wonjae Lee
DOI:10.1007/s12272-012-0609-6
日期:2012.6
the separation of α-aminoacidesters as benzophenone Schiff base derivatives on coated chiral stationary phases (CSPs) (Chiralcel OD-H, Chiralcel OD, Chiralpak AD-H, Chiralpak AD, and Chiralpak AS) or covalently immobilized CSPs (Chiralpak IA, Chiralpak IB, and Chiralpak IC) derived from polysaccharide derivatives is described. Benzophenone imine derivatives of α-aminoacidesters were readily prepared
New approaches to the asymmetric synthesis of non-proteinogenic α-amino acids and dipeptides through chiral β-lactam intermediates
作者:Iwao Ojima、Hauh-Jyun C. Chen、Xiaogang Qiu
DOI:10.1016/s0040-4020(01)86038-5
日期:1988.1
Novel and effective routes to optically pure aromatic α-amino acids, α-methyl-α-amino acids and their derivatives including dipeptides are developed via homochiral β-lactams which are obtained through asymmetric [2+2] cycloadditions of ketenes to imines.