A simple one-step synthesis of phenyl ethers from phenyl acetates
作者:Sunil K. Banerjee、Bishan D. Gupta、Kuber Singh
DOI:10.1039/c39820000815
日期:——
Phenylacetates when refluxed with alkyl halides in acetone solution in the presence of a crown ether and anhydrous potassium carbonate undergo alkylation yielding phenylethers.
Structural modification of a specific antimicrobial lead against Helicobacter pylori discovered from traditional Chinese medicine and a structure–activity relationship study
Psoralen (1a) was found to be a specific and potent antimicrobial lead against Helicobacter pylori (H. pylori) from a traditional Chinese medicine (TCM) in the bioassay directed isolation. A series of structurally diverse analogues of la were thus designed and synthesized to improve the antimicrobial potency, some of which showed more potent activities than the lead compound (1a) against H. pylori. Among them, compound 25a is 16-fold stronger (MIC = 0.39 mu g/mL) than 1a (MIC = 6.25 mu g/mL), and is even potent than the positive control metronidazole (MIC = 0.50 mu g/mL). The in vitro antimicrobial activities against H. pylori of these structurally diverse analogues based on the scaffold of la have also led to an outline of structure-activity relationship. (C) 2010 Elsevier Masson SAS. All rights reserved.
Experiments with Xanthotoxin and Imperatorin Obtained from the Fruits of Ammi majus (L.)