(3aR,4S,5S,11bS)-3-Benzyl-4-(2-methyl-[1,3]dithiolan-2-yl)-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-5,6-dicarboxylic acid dimethyl ester 在
三氟化硼 、
mercury(II) oxide 作用下,
以
乙醚 为溶剂,
以95%的产率得到(3aR,4S,5S,11bS)-4-Acetyl-3-benzyl-2,3,3a,4,5,7-hexahydro-1H-pyrrolo[2,3-d]carbazole-5,6-dicarboxylic acid dimethyl ester