Document Detail


Synthesis and chemical behaviour of D-glucosyl esters of glutamic acid having the side-chain carboxyl group involved in the glycosidic linkage.
MedLine Citation:
PMID:  1268876     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Simultaneous and stepwise deprotection of the fully benzylated D-glucosyl esters of 1-benzyl N-benzyloxycarbonyl- and N-tert-butyloxycarbonyl-L-glutamic acid (1 and 5, respectively) have been examined. Catalytic hydrogenation of 1 led to intramolecular aminolysis to give pyroglutamic acid and D-glucose, but similar treatment in the presence of trifluoroacetic acid afforded both anomers of 1-O-(L-gamma-glutamyl)-D-glucopyranose, which were characterized as trifluoroacetates (2alpha and 2beta) and converted into 2,3,4,6-tetra-O-acetyl-1-O-[1-methyl N-(acetyl)-L-glutam-5-oyl]-D-glucopyranose (4) which was also prepared by a definitive method. Hydrogenolysis of 5 gave both anomers of 1-O-[N-(tert-butyloxycarbonyl)-L-gamma-glutamyl]-D-glucopyranose (6), which, upon treatment with trifluoroacetic acid at - 10 degrees, afforded 2alpha and 2beta, respectively. The structure of 6beta was established by its conversion into 2,3,4,6-tetra-O-acetyl-1-O-[1-methyl N-(tert-butyloxycarbonyl)-L-glutam-5-oyl]-beta-D-glucopyranose (7beta), whereas similar treatment of 6alpha gave a mixture of 1,3,4,6-tetra-O-acetyl-2-O-[1-methyl N-(tert-butyloxycarbonyl)-L-glutam-5-oyl]-alpha-D-glucopyranose (9) and 7alpha. A 1 leads to 2 acyl migration occurred during esterification of the aglycon carboxyl group of 6alpha with diazomethane to give 2-O-[1-methyl N-(tert-butyloxycarbonyl)-L-glutam-5-oyl]-alpha-D-glucopyranose (8).
Authors:
D Keglević; J Horvat; F Plavsić
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Carbohydrate research     Volume:  47     ISSN:  0008-6215     ISO Abbreviation:  Carbohydr. Res.     Publication Date:  1976 Mar 
Date Detail:
Created Date:  1976-08-02     Completed Date:  1976-08-02     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0043535     Medline TA:  Carbohydr Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  49-61     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Chemical Phenomena
Chemistry
Glucosides* / chemical synthesis
Glutamates*
Glycosides* / chemical synthesis
Magnetic Resonance Spectroscopy
Methods
Optical Rotation
Structure-Activity Relationship
Chemical
Reg. No./Substance:
0/Glucosides; 0/Glutamates; 0/Glycosides

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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