反应详情

The product of Step A (3.2 g, 13.8 mmol) was refluxed in 1,2-dichlorobenzene for 3 days in the presence of a catalytic amount of BHT (10 mg). Flash column chromatography of the mixture using hexane and then 10% and 20% ethyl acetate in hexane afforded 3.1 g (97%) of the title compound.