反应详情

2,5-Dihydroxy-1,4-dithiane (76 g) and cyanoacetamide (84 g) were added to a mixture of methanol (180 mL), water (10 mL) and triethylamine (10 g). The resulting mixture was heated at 35–40° C. for about 30 minutes while stirring, and then heated to 50–60° C. for an additional 30 minutes with stirring. The reaction mixture was then cooled to room temperature and poured into a mixture of ice (100 g)/water (300 mL). A fine precipitate formed upon addition, which was filtered and dried overnight to give 100.6 g of the title compound as a pale gray powder ((M+H)+=143, M.P.=159.0–159.6° C.).

1. temperatureThe resulting mixture was heated at 35–40° C. for about 30 minutes
2. temperatureheated to 50–60° C. for an additional 30 minutes
3. stirringwith stirring
4. customA fine precipitate formed upon addition, which
5. filtrationwas filtered
6. customdried overnight