Synthesis of novel glycolipids derived from glycopyranosyl azides and N-(β-glycopyranosyl)azidoacetamides
摘要:
A general and expedient method based on a click reaction has been developed for the synthesis of novel glycolipids. The Cu(I) catalyzed [3+2] cycloaddition of several fully acetylated beta- as well as alpha-D-glycopyranosyl azides, including the 1,6-diazide derived from D-glucose, with long chain alkyl propargyl ethers gave the respective 1,4-substituted 1,2,3-triazole derivatives in good yields. Treatment of fully acetylated N-(beta-glycopyranosyl)azidoacetamides under similar conditions with alkyl propargyl ethers afforded the 1,2,3-triazolylacetamido derivatives in fairly good yields. Zemplen de-O-acetylation of all the fully acetylated derivatives furnished the free glycolipids in quantitative yields. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of novel glycolipids derived from glycopyranosyl azides and N-(β-glycopyranosyl)azidoacetamides
作者:Katuri J.V. Paul、Duraikkannu Loganathan
DOI:10.1016/j.tetlet.2008.08.073
日期:2008.10
A general and expedient method based on a click reaction has been developed for the synthesis of novel glycolipids. The Cu(I) catalyzed [3+2] cycloaddition of several fully acetylated beta- as well as alpha-D-glycopyranosyl azides, including the 1,6-diazide derived from D-glucose, with long chain alkyl propargyl ethers gave the respective 1,4-substituted 1,2,3-triazole derivatives in good yields. Treatment of fully acetylated N-(beta-glycopyranosyl)azidoacetamides under similar conditions with alkyl propargyl ethers afforded the 1,2,3-triazolylacetamido derivatives in fairly good yields. Zemplen de-O-acetylation of all the fully acetylated derivatives furnished the free glycolipids in quantitative yields. (c) 2008 Elsevier Ltd. All rights reserved.
Triazole-Linked Glycolipids Enhance the Susceptibility of MRSA to β-Lactam Antibiotics
We show here that a series of triazolyl glycolipid derivatives modularly synthesized by a "click" reaction have the ability to increase the susceptibility of a drug-resistant bacterium to beta-lactam antibiotics. We determine that the glycolipids can suppress the minimal inhibitory concentration of a number of ineffective beta-lactams, upward of 256-fold, for methicillin-resistant Staphylococuss aureus (MRSA). The mechanism of action has been preliminarily probed and discussed.