A Practical Approach to the Synthesis of 2,4-Disubstituted Oxazoles from Amino Acids
摘要:
[GRAPHICS]A new sequence for the synthesis of various 2,4-disubstituted oxazoles from alpha-amino acids is reported. The method is shown to be general and incorporates the reagent combination, triphenylphosphine/hexachloroethane, for cyclodehydration of intermediate alpha-acylamino aldehydes. Implementation of this reagent system for the conversion of alpha-acylamino ketones to oxazoles is briefly investigated.
This invention is concerned with antimicrobial compositions that control or prevent resistance to antimirobial effectiveness, more particularly to combinations of topical antimicrobial agents with antimutagenic or antioxidant agents that block intrinsic or acquired bacterial resistance.