Reductive Amination of Glycosyl Aldoses: Synthesis ofN‐Glycosylated β‐Glycosyl Amino Alcohols and their Enzyme Inhibitory Effect
摘要:
Reductive amination of glycosyl aldehydes (la-c, 2) with glycosyl amino esters (3a-c, 4) in the presence of sodium borohydride gave diglycosylated amino esters (5-15) in good yield. N-Glycosyl-glycosylated amino esters were reduced to the respective diglycosyl amino alcohols (16-26) with LiAlH4 in good yield. All the synthesized compounds were studied for their inhibitory effect, if any, against hepatic glucose-6-phosphatase, glycogen phosphorylase, and intestinal brush border membrane alpha-glucosidase; among these compounds 7, 21, and 25 have shown marked inhibition on these enzymes, respectively.
Asymmetric organocatalysis with glycosyl-β-amino acids: direct asymmetric aldol reaction of acetone with aldehydes
作者:Namrata Dwivedi、Surendra S. Bisht、Rama P. Tripathi
DOI:10.1016/j.carres.2006.08.007
日期:2006.11
Directasymmetricaldolreaction of acetone with aromatic aldehydes was achieved in good yields and high enantioselectivity using 5-amino-5-deoxy-beta-L-ido-(alpha-D-gluco)-heptofuranuronic acids as a new class of organocatalysts.
A series of glycosylated P-amino acids was prepared and evaluated against Mycohacterium tuberculosis, M. avium, M. fortuitum and M. smegmatis. The compounds were designed to mimic the enzyme D-alanine racemase and glycosyl transferase involved in the biosynthesis of essential cell wall peptidoglycan and arabinogalactan. Though most of the compounds exhibited little activity, however, one showed significant activity against all the strains in cell culture and activity was confirmed by BACTEC method. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.