(8bR,8cR)-4,8-Dichloro-8b,8c-dimethyl-1,4a,5,8a,8b,8c-hexahydro-cyclopenta[def]fluorene-2,6-dicarboxylic acid dimethyl ester 在
N-溴代丁二酰亚胺(NBS) 作用下,
以
四氯化碳 为溶剂,
以85%的产率得到(4aR,8aR,8bS,8cS)-4a,8a-Dibromo-4,8-dichloro-8b,8c-dimethyl-1,4a,5,8a,8b,8c-hexahydro-cyclopenta[def]fluorene-2,6-dicarboxylic acid dimethyl ester