Biocatalytic resolution of β-fluoroalkyl-β-amino acids
摘要:
N-Phenylacetyl derivatives of beta-fluoroalkyl-beta-alanines 6 were synthesized and biocatalytically resolved to the corresponding enantiopure beta-amino acids 7, 9 with the aid of penicillin acylase (EC 3.5.1.11) from Escherichia coli. In substrates 6 the enantioselectivity of the biocatalytic process was practically uninfluenced by the nature of the fluoroalkyl chain. Thus, beta-fluoroalkyl-beta-alanines 7, 9 bearing short (R = CF3, CHF2) or long [C3F7, H(CF2)(4)] chains were prepared in high enantiomeric purity. The (R)-enantiomer was the fast-reacting enantiomer in all cases.
Transamination of fluorinated β-keto carboxylic esters. A biomimetic approach to β-polyfluoroalkyl-β-amino acids.
作者:Vadim A. Soloshonok、Alexander G. Kirilenko、Valery P. Kukhar'、Giuseppe Resnati
DOI:10.1016/s0040-4039(00)73652-5
日期:1993.5
The base-catalyzed isomerization of N-benzylimines (or enamines) of beta-polyfluoroalkyl-beta-ketocarboxylic esters cleanly affords the N-benzylidene derivatives of beta-polyfluoro-beta-aminocarboxylic esters which are hydrolyzed to corresponding amino acids in high overall yields.