Catalytic asymmetric synthesis of β-fluoroalkyl-β-amino acids via biomimetic [1,3]-proton shift reaction
作者:Vadim A. Soloshonok、Alexander G. Kirilenko、Sergey V. Galushko、Valery P. Kukhar
DOI:10.1016/s0040-4039(00)73320-x
日期:1994.7
[1,3]-Protonshiftreaction of N-benzylenamines 1a-e, derived from β-polyfluoroalkyl-β-ketocarboxylic esters and benzylamine, was catalyzed by (-)-cinchonidine (5–13 mol %) to give good yields (67–89%) of enantiomerically enriched (up to 36% ee) N-benzylidene derivatives 3a-e. The resulting products 3a-e were readily hydrolyzed into the corresponding optically active (R)-β-polyfluoroalkyl-β-amino acids
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.