反应详情

A 25 percent solution of sodium methoxide in methanol (1.9 ml, 0.0085 mol) was added to a solution of 19.9 g (0.065 mol) of 3-benzylthio-7-fluoro-5-methylthio-1,2,4-triazolo[4,3-c]pyrimidine containing a small amount of 2-benzylthio-7-fluoro-5-methylthio-1,2,4-triazolo[1,5-c]pyrimidine and 11.2 g (0.065 mol) of diethyl maleate in 250 ml of ethanol at ambient temperature with stirring and allowed to react for about 1 hour. Acetic acid (4 ml) was then added and the volatiles were removed by evaporation under reduced pressure. The residue was dissolved in methylene chloride and the resulting solution was extracted with water, dried over magnesium sulfate, and concentrated by evaporation under reduced pressure. The residue was triturated with hexane, filtered, and dried to obtain 10.7 g of the title compound as a white powder melting at 121°-122° C. The nmr and uv spectra were consistent with the assigned structure.

1. customto react for about 1 hour
2. customthe volatiles were removed by evaporation under reduced pressure
3. dissolutionThe residue was dissolved in methylene chloride
4. extractionthe resulting solution was extracted with water
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated by evaporation under reduced pressure
7. customThe residue was triturated with hexane
8. filtrationfiltered
9. customdried