methyl 4,9-dimethyl-4-(4-methoxyphenyl)-10-oxo-4,10-dihydrocarbazolo[2,3-b]thiophene-2-carboxylate 在
三溴化硼 作用下,
以
二氯甲烷 为溶剂,
以96%的产率得到4-(4-Hydroxy-phenyl)-4,9-dimethyl-10-oxo-9,10-dihydro-4H-1-thia-9-aza-cyclopenta[b]fluorene-2-carboxylic acid methyl ester