反应详情

To the methanolic solution of the product of Step A that was cooled to 5° in an ice-water bath was added anhydrous methylamine for 8 minutes. The reaction mixture was stirred at ambient temperature for 17 hours, then evaporated under reduced pressure to give the product as a yellow oil that was placed on 55 g of silica gel and chromatographed using a gradient elution of methylene chloride-methanol. The appropriate fraction was evaporated, dissolved in methanol and diluted with diethyl ether to yield the title compound (2.32 g) as a solid that was dried in vacuo at ambient temperature over P2O5 for 3 hours, mp 86°-92°.

1. customevaporated under reduced pressure