Synthesis and Antibacterial Activity of New
<i>N</i>
‐Alkylammonium and Carbonate‐Triazole Derivatives within Desosamine of 14‐ and 15‐Membered Lactone Macrolides
Desosamines of azithromycin (AZM) and clarithromycin (CLA) were modified by N‐alkylation or nucleophilic substitution at the carbonyl/CuAAC sequence. Biological studies revealed a higher antibacterial potency of quaternary N‐alkylammonium bromides of CLA as compared to AZM. SAR studies of CLA salts, including biological, conformation and molecular‐docking analysis, enriched by physicochemical parameters
[RuCl2(DMSO)4] in the presence of N-benzylated 1,3,5-triaza-7-phosphaadamantane efficiently catalyzed the hydration of glycosyl cyanides to the corresponding formamide derivatives in water or water–N-methylpyrrolidone solvent mixtures at 105 °C. O-Acetyl, O-benzoyl, and O-benzyl protecting groups, anomeric bromide and azide substituents as well as double bonds were shown to be compatible with these
Preparation and photolysis of 1-cyano-glycopyranosyl azides
作者:Jean-Pierre Praly、Carméla Di Stèfano、Gérard Descotes、René Faure、László Somsák、István Eperjesi
DOI:10.1016/0040-4039(95)00520-m
日期:1995.5
Treatment of 1-bromo-glycopyranosyl cyanides 1 and 4 with sodiumazide in dimethyl sulfoxide gave 1-cyano-glycopyranosyl azides 2 and 5 in high yield, which on photolysis resulted in new oxazepine derivatives 3 and 6.
Staudinger reaction of acetylated (1R)-1-azido-D-galactopyranosyl cyanide (1) with triphenylphosphine in diethyl ether led to the isolation of a crystalline phosphazide (2), unprecedented in carbohydrate chemistry. Spontaneous decomposition of 2 in toluene furnished the mixture of the unsaturated lactone 4, as minor product, and two major products: the triphenylphosphoranylidene derivatives of (2Z