Lipase-Catalyzed Regioselective Acylation and Deacylation of Glucose Derivatives
作者:
KirkOle,
ChristensenMorten Würtz,
BeckFrederik,
DamhusTure,
期刊:
Biocatalysis and Biotransformation
(Taylor Available online 1995)
卷期:
Volume 12,
issue 2
页码: 91-97
ISSN:1024-2422
年代: 1995
DOI:10.3109/10242429508998155
出版商: Taylor&Francis
关键词: Immobilized lipase;glucose pentaacetate;chemo-enzymatic synthesis
数据来源: Taylor
摘要:
In the development of an efficient synthesis of 1-O-decanoyl-2,3,4,6-tetra-O-acetyl-β-D-glucose (β-2) several lipase-based approaches have been explored. Among five immobilized Upases tested, the lipase fromCandida antarcticaproved particularly efficient for catalyzing selective hydrolysis in the 1-position of 1,2,3,4,6-penta-O-acetyl-β-D-glucose (β-1). Using triethylamine as catalyst, the hydrolysis product 2,3,4,6-tetra-O-acetyl-D-glucose (3) can be esterified with decanoyl chloride to formβ-2 selectively, thereby providing an efficient chemo-enzymatic synthesis starting from readily available raw materials. Attempts to produceβ-2 fromβ-1 by lipase-catalyzed interesterification or to esterify 3 with decanoic acid using a lipase as catalyst were unsuccessful. The latter finding was explained by the hemiacetal OH group of glucose being unable to act as nucleophile in the lysis of the lipase acyl-enzyme intermediate. Furthermore,β-2 was found to bee a too bulky substrate to fit into the active site of any of the lipases tested.
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