乙酸酐 、
(1R,9R)-8,11-diacetyl-3-bromo-13-methyl-2,8,11,13-tetrazatetracyclo[7.6.0.02,6.010,14]pentadeca-3,5,10(14)-triene-7,12-dione 在
4-二甲氨基吡啶 作用下,
生成 [(1R,9R,10R,14R)-8,11-diacetyl-3-bromo-13-methyl-7,12-dioxo-2,8,11,13-tetrazatetracyclo[7.6.0.02,6.010,14]pentadeca-3,5-dien-14-yl] acetate 、 [(1R,9R,10S,14S)-8,11-diacetyl-3-bromo-13-methyl-7,12-dioxo-2,8,11,13-tetrazatetracyclo[7.6.0.02,6.010,14]pentadeca-3,5-dien-14-yl] acetate