反应详情

50 G. of dimethyl 6-[3,6-dihydro-1(2H)-pyridyl]-2,4-pyrimidine-dicarbamate-3-oxide are heated to 140° C. under an argon atmosphere in 300 ml. of dimethylformamide while stirring for 30 minutes. The dimethylformamide is evaporated under reduced pressure and the residue is recrystallized from methanol/methylene chloride. There is obtained methyl 5-[3,6-dihydro-1(2H)-pyridyl]-2-oxo-2H-[1,2,4]-oxadiazolo[2,3-a]pyrimidine-7-carbamate, having a melting point of 213°-215° C. (decomposition).

1. customThe dimethylformamide is evaporated under reduced pressure
2. customthe residue is recrystallized from methanol/methylene chloride