Protease-Catalyzed Monoacylation of 2-<i>O</i>-α-<scp>D</scp>-Glucopyranosyl-<scp>L</scp>-ascorbic Acid in Three Solvent Systems
作者:Akihiro TAI、Yuji IWAOKA、Tasuku MORI、Hideyuki ITO
DOI:10.1271/bbb.100362
日期:2010.9.23
6-O-Dodecanoyl-2-O-α-d-glucopyranosyl-l-ascorbic acid (6-sDode-AA-2G) was synthesized from 2-O-α-d-glucopyranosyl-l-ascorbic acid and vinyl laurate with a protease from Bacillus subtilis in 30% dimethylformamide (DMF)/dioxane with a low water content. The addition of 3% (v/v) water to DMF/dioxane dramatically enhanced the 6-sDode-AA-2G synthesis. The optimum reaction conditions enabled 6-sDode-AA-2G to be synthesized in a yield of 38.1%.
Monoacylation of 2-O-α-d-glucopyranosyl-l-ascorbic acid by protease in N,N-dimethylformamide with low water content
作者:Akihiro Tai、Tasuku Mori、Yuka Kimura、Hideyuki Ito
DOI:10.1016/j.carres.2010.04.028
日期:2010.8
2-O-alpha-D-Glucopyranosyl-L-ascorbic acid (AA-2G) laurate was synthesized from AA-2G and vinyl laurate with a protease from Bacillus subtilis in N,N-dimethylformamide (DMF) with low water content. Addition of water to DMF dramatically enhanced monoacyl AA-2G synthesis. Maximum synthetic activity was observed when 3% (v/v) water was added to the reaction medium. Under the optimal reaction conditions, 5-O-dodecanoyl-2-O-alpha-D-glucopyranosyl-L-ascorbic acid, 2-O-(6'-O-dodecanoyl-alpha-D-glucopyranosyl)-L-ascorbic acid, and 6-O-dodecanoyl-2-O-alpha-D-glucopyranosyl-L-ascorbic acid were synthesized in yields of 5.5%, 3.2%, and 20.4%, respectively. (C) 2010 Elsevier Ltd. All rights reserved.
Intramolecular acyl migration and enzymatic hydrolysis of a novel monoacylated ascorbic acid derivative, 6-O-dodecanoyl-2-O-α-d-glucopyranosyl-l-ascorbic acid
series of monoacyl AA-2G derivatives. Our previous studies indicate that a series of the derivatives is a readily available source of AA activity in vitro and in vivo, and suggested that intramolecular acylmigration of the derivatives might have occurred in a neutral aqueous solution. In this study, intramolecular acylmigration and enzymatic hydrolysis of a monoacyl AA-2G derivative, 6-O-dodecanoyl-2-