反应详情

A solution of 223 g (1 mole) of 1-(5-methyl-1,3-dioxan-5-yl)-2-bromoethan-1-one in 200 ml of tetrahydrofuran is added dropwise in the course of 2 hours to a suspension, stirred under pure nitrogen, of 100 g (1.1 moles) of sodium 1,2,4-triazolide in 300 ml of dry tetrahydrofuran, at 25° C. The mixture is refluxed for 8 hours, the inorganic precipitate is then filtered off, and the filtrate is concentrated to half its volume. It is then seeded and left to stand overnight at +3° C. The precipitate is filtered off, washed with 30 ml of cold (+5° C.) tetrahydrofuran, then with 80 ml of ether and thereafter with 100 ml of n-pentane, and dried. 184 g (87.2%) of 1-(5-methyl-1,3-dioxan-5-yl)-2-(1,2,4-triazol-1-yl)-ethan-1-one are obtained as white crystals of melting point 95°-97° C.

1. temperatureThe mixture is refluxed for 8 hours
2. filtrationthe inorganic precipitate is then filtered off
3. concentrationthe filtrate is concentrated to half its volume
4. waitleft
5. filtrationThe precipitate is filtered off
6. washwashed with 30 ml of cold (+5° C.) tetrahydrofuran
7. dry with materialwith 80 ml of ether and thereafter with 100 ml of n-pentane, and dried