反应详情

To a cooled (6°) suspension of 3,4-dimethoxy-1,2,5-thiadiazole 1,1-dioxide (0.74 g; 4.17 mmoles) in 80 ml of methanol was added dropwise over a period of 45 minutes a solution of 2-[(2-dimethylaminomethyl-4-thiazolyl)methylthio]ethylamine (0.96 g; 4.17 mmoles) [prepared in Step E] to give 3-{2-[(2-dimethylaminomethyl-4-thiazolyl)methylthio]ethylamino}-4-methoxy-1,2,5-thiadiazole 1,1-dioxide, Rf=0.64 [Silica/CH2Cl2 :CH3OH (9:1)]. The temperature was maintained at 6° and anhydrous methylamine was bubbled into the solution for 8 minutes. The reaction mixture was evaporated under reduced pressure and the residue placed on 80 g of silica gel and chromatographed using a gradient elution of methylene chloride-methanol. The appropriate fractions were combined and the residue was rechromatographed on 25 g of aluminum oxide using a gradient elution of methylene chloride-methanol to give 0.52 g of product. Recrystallization from isopropyl alcohol/ether yielded the title compound, mp 144°-148° (foaming).

1. temperatureTo a cooled