Bioscience, Biotechnology, and Biochemistry 2001-09-01

Enzyme-assisted preparation of D-tert.-leucine.

K Laumen, O Ghisalba, K Auer

Index: Biosci. Biotechnol. Biochem. 65(9) , 1977-80, (2001)

Full Text: HTML

Abstract

Optically pure D-tert.-leucine was obtained by the enzymatic hydrolysis of (+/-)-N-acetyl-tert. leucine chloroethyl ester after about 50% conversion, this being catalyzed by a protease from Bacillus licheniformis (Alcalase), and subsequent acidic saponification of the recovered ester. Among the methyl, ethyl, octyl, chloroethyl and trichloroethyl esters, the chloroethyl ester exhibited the highest rate of hydrolysis.