反应详情

To a solution of sodium ethoxide in ethanol (prepared by adding 13.5 g of anhydrous sodium methoxide to 300 ml of absolute ethanol) was added 31 g of 2-methylamino-5-mercapto-1,3,4-thiadiazole. After stirring for 15 min. at room temperature, 36 g of benzyl bromide was added to the homogeneous solution and the reaction heated to reflux of 4 hrs. At the end of the reflux period, most of the ethanol was removed at reduced pressure, water was added and the reaction extracted with ethyl acetate, which was washed with water and saturated NaCl, then dried over Na2SO4. Removal of the solvent gave a viscous oil which was crystallized from a mixture of ether and petroleum ether to give 29.7 g of 2-methylamino-5-benzylthio-1,3,4-thiadiazole, MP 87°-89° C.

1. temperaturethe reaction heated
2. temperatureto reflux of 4 hrs
3. customAt the end of the reflux period, most of the ethanol was removed at reduced pressure, water
4. additionwas added
5. extractionthe reaction extracted with ethyl acetate, which
6. washwas washed with water and saturated NaCl
7. dry with materialdried over Na2SO4
8. customRemoval of the solvent
9. customgave a viscous oil which
10. customwas crystallized from a mixture of ether and petroleum ether