(1R,15R,17S,18S)-17-ethyl-7-hydroxy-N-methyl-3,13-diazapentacyclo[13.3.1.02,10.04,9.013,18]nonadeca-2(10),4(9),5,7-tetraene-3-carboxamide 、
乙酸酐 在
4-二甲氨基吡啶 作用下,
反应 16.0h,
以60%的产率得到[(1R,15R,17S,18S)-17-ethyl-3-(methylcarbamoyl)-3,13-diazapentacyclo[13.3.1.02,10.04,9.013,18]nonadeca-2(10),4(9),5,7-tetraen-7-yl] acetate