benzyl N-(9,11-dioxatricyclo[6.3.0.03,6]undeca-1(8),2,6-trien-4-yl)-N-[[5-[2-tri(propan-2-yl)silylethynyl]-1,3-benzodioxol-4-yl]methyl]carbamate 以
乙腈 、
5,5-dimethyl-1,3-cyclohexadiene 为溶剂,
反应 2.0h,
以65%的产率得到7,14-dihydro-12b
H-[1,3]dioxolo[4,5-
i][1,3]dioxolo[4',5':4,5]benzo[1,2-
c]phenanthridine-13-carboxylic acid benzyl ester