5β,6,7,8β-tetrachloro-1α,4α,8aα,10aα-tetrahydro-1,4-methano-5,8-dimethoxymethanoanthracene-9,10-dione 在
titanium(III) chloride 作用下,
以
丙酮 为溶剂,
以195 mg的产率得到5β,6,7,8β-tetrachloro-1α,4α,4aα,10aα,8aα,9aα-hexahydro-1,4-methano-5,8-dimethoxymethanoanthracene-9,10-dione