反应详情

A solution of 3-bromo-7-[(phenoxyacetyl)amino]-8-oxo-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (diphenylmethyl)ester (784 mg, 1.4 mmol) in triethyl phosphite (4 mL) was refluxed under nitrogen for 90 minutes. After cooling, the reaction was poured into hexanes. The supernatant liquid was decanted from the resulting semi-solid which was then dissolved in ethyl acetate and purified by flash-chromatography on silica gel (50% ethyl acetate/hexanes to 100% ethyl acetate) to provide 7-[(phenoxyacetyl)amino]-8-oxo-3-(diethoxyphosphinyl)-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid (diphenylmethyl) ester (100 mg; 16%):

1. temperatureAfter cooling
2. customThe supernatant liquid was decanted from the resulting semi-solid which
3. dissolutionwas then dissolved in ethyl acetate
4. custompurified by flash-chromatography on silica gel (50% ethyl acetate/hexanes to 100% ethyl acetate)