N-Blocked-D-glutamic acid diethylesters are gamma-regioselectively amidated in a reaction catalysed by Candida antarctica lipase B, carried out in an anhydrous organic solvent. The ratio of gamma:alpha-monoamides, as a measure of regioselectivity, depends on the N-protecting group present in the substrate. In the examples reported in this work, we have found that gamma:alpha ranges from about 4 (N-group = Cbz) to 35 (N-group = isobutyryl). No diamides were detected. (C) 2000 Elsevier Science Ltd. All rights reserved.
Enantioselective hydrolyses by baker's yeast - II
作者:B.I. Glänzer、K. Faber、H. Griengl
DOI:10.1016/s0040-4020(01)90011-0
日期:——
D-N-Acetyl amino acid esters were obtained via enantioselective hydrolysis of their racemates by use of fermenting yeast. Evidence is given that proteinases are the enzymes involved.