An Improved Chemo-Enzymatic Synthesis of 1-β-<i>O</i>-Acyl Glucuronides: Highly Chemoselective Enzymatic Removal of Protecting Groups from Corresponding Methyl Acetyl Derivatives
作者:Akiko Baba、Tadao Yoshioka
DOI:10.1021/jo701547b
日期:2007.12.1
developed from the corresponding methyl acetyl derivatives 3a−f, which were stereospecifically synthesized from cesium salts of carboxylic acids 1a−f and methyl 2,3,4-tri-O-acetyl-1-bromo-1-deoxy-α-d-glucopyranuronate (2). Chemoselectivity of lipase AS Amano (LAS) in the hydrolytic removal of O-acetyl groups of 3a−f to provide methyl esters 4a−f was influenced by the nature of their 1-β-O-acyl groups; high