反应详情

In a manner similar to the above (1), a solution of 75 mg of diphenylmethyl (2R)-3-methyl-2-[(1R,5S)-3-benzyl-7-oxo-4-oxa-2,6-diazabicyclo[3,2,0]hept-2-en-6-yl]-3-butenoate in 5 ml of methylene chloride is stirred at room temperature for 1 hour in the presence of 0.03 ml of triethylamine to afford diphenylmethyl-2-[(1R,5S)-3-benzyl-7-oxo-4-oxa-2,6-diazabicyclo[3,2,0]hept-2-en-6-yl]-2-butenoate in 95% yield. mp. 104.5°-106° C.