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.
Reductive Amination of Glycosyl Aldoses: Synthesis of<i>N</i>‐Glycosylated β‐Glycosyl Amino Alcohols and their Enzyme Inhibitory Effect
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.
Synthesis and Antitubercular Evaluation of Diverse Glycosylated Ureas from D-Glucose
作者:Neetu Tripathi、Vinod K. Tiwari
DOI:10.1155/2024/8709672
日期:2024.2.2
N, N-disubstituted glycosylated ureas have been synthesized in good-to-excellent yields by 1,4-conjugate addition of amines to glycosylated olefinic esters followed by reaction of resulting glycosyl β-amino esters with diisocyanates. The developed sugar-based molecules were well characterized by extensive standard spectroscopic analysis including NMR (1H, 13C, and DEPT), IR, MS, and elemental analysis
通过将胺1,4-共轭加成到糖基化烯酯上,然后将所得糖基β-氨基酯与二异氰酸酯反应,以良好至优异的产率合成了N,N-二取代的糖基化脲。所开发的糖基分子通过广泛的标准光谱分析(包括 NMR(1 H、13 C 和 DEPT)、IR、MS 和元素分析)得到了很好的表征,并筛选了其抗结核分枝杆菌( M. Tb. )的生物活性。 ,其中一些表现出有效的抗结核活性。这些分子的设计考虑了参与分枝杆菌细胞壁聚合物生物合成的众所周知的酶抑制剂,并且可以作为先导分子进一步探索,以成功开发潜在的抗结核候选药物。