Enzyme catalysed hydrolyses of dialkylated propanedioic acid diesters have been studied. A novel change of enantioselectivity from pro-S to pro-R in the hydrolysis of ester groups was observed, depending on the chain length of the alkyl substituents of the substrate. Optically pure (S)-(-)-α-methylphenylalanine was prepared by α-chymotrypsin catalysedhydrolysis of benzylmethylpropanedioic acid dimethyl
Enantioselective Synthesis of α-Quaternary Amino Acid Derivatives by Sequential Enzymatic Desymmetrization and Curtius Rearrangement of α,α-Disubstituted Malonate Diesters
作者:Violeta Iosub、Anton R. Haberl、Jennifer Leung、Michael Tang、Kannan Vembaiyan、Masood Parvez、Thomas G. Back
DOI:10.1021/jo902584r
日期:2010.3.5
A convenient and versatile enantioselective synthesis of biologically important α-quaternary amino acid derivatives was based on the sequential double alkylation or arylation of dimethyl malonate, followed by desymmetrization with porcine liver esterase (PLE) and Curtius rearrangement. The PLE-mediated hydrolysis of the prochiral dialkylated malonate diesters produced the corresponding chiral half-esters