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.
[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.
Conversions of sulfone-containing vinyl azides to vinyl triazoles and enamides
作者:Niall Collins、Goar Sánchez-Sanz、Paul Evans
DOI:10.1016/j.tet.2021.131933
日期:2021.3
the efficient conversion of four 3-sulfonyl prop-1-enyl azides into seven 3-sulfonyl prop-1-enyl triazoles. Results demonstrate that the stereochemical integrity of the alkene was maintained during this process. The conversion of (Z)-((3-azidoallyl)sulfonyl)benzene into the corresponding Z-enamides proved more challenging and only modest yields of (Z)-N-(3-(phenylsulfonyl)prop-1-en-1-yl)acetamide and