反应详情

A mixture of ethyl 3,10-dihydro-10-oxo-1H-pyrido[1,2-a]thieno[3,4-d]pyrimidine-7-carboxylate (2.0 g., 0.0072 mol) and m-chloroperbenzoic acid (1.47 g., 0.0072 mol) in chloroform (75 ml) is stirred at room temperature overnight. The solvent is evaporated at reduced pressure to give a syrup, which crystallizes from ethanol. Recrystallization from ethanol, silica gel chromatography and a further recrystallization from ethanol gives the product as yellow crystals (mp 175° C.).

1. customThe solvent is evaporated at reduced pressure
2. customto give a syrup, which
3. customcrystallizes from ethanol
4. customRecrystallization from ethanol, silica gel chromatography
5. customa further recrystallization from ethanol