(S)-9-hydroxy-8-methoxy-12a,13-dihydro-6H-benzo[5,6][1,4]diazepino[1,2-a]indol-6-one 、
(12aS)-9-hydroxy-8-methoxy-11-methyl-12a,13-dihydro-12H-indolo[2,1-c][1,4]benzodiazepin-6-one 、 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以14%的产率得到methyl 4-[3-[[(12aS)-8-methoxy-11-methyl-6-oxo-12a,13-dihydro-12H-indolo[2,1-c][1,4]benzodiazepin-9-yl]oxymethyl]-5-[[(12aS)-8-methoxy-6-oxo-12a,13-dihydroindolo[2,1-c][1,4]benzodiazepin-9-yl]oxymethyl]-N-[2-[2-(2-methoxyethoxy)ethoxy]ethyl]anilino]butanoate