2ξ-methanesulfonyloxy-3c-methoxy-6-oxo-(4ar)-2,3,4,4a,5,6-hexahydro-1H-[1,3]dioxolo[4,5-j]phenanthridine-11bt-carboxylic acid 2-(4-bromo-phenyl)-2-oxo-ethyl ester 在
potassium carbonate 作用下,
以
1,4-二氧六环 为溶剂,
生成 11b-diazoacetyl-2ξ-methanesulfonyloxy-3
c-methoxy-(4a
r,11b
t)-1,3,4,4a,5,11b-hexahydro-2
H-[1,3]dioxolo[4,5-
j]phenanthridin-6-one