反应详情

To a solution of 965 mg. (2 mmole) of p-nitrobenzyl 7-phenoxyacetamido-3-methylenecepham-4-carboxylate in 10 ml. of methylene chloride were added 175 mg of dry pyridine and 460 mg. of phosphorus pentachloride and the mixture was stirred at room temperature for 6 hours. One ml. of isobutanol was added to the mixture which was then stored at 0° C. overnight. The reaction product, p-nitrobenzyl 7-amino-3-methylenecepham-4-carboxylate hydrochloride, which formed as a crystalline precipitate was filtered to yield 430 mg. (58% yield).