反应详情

Potassium carbonate (29.7 g) was added to a solution of 6-trimethylsilanylethynylbenzothiazol (45.1 g) in methanol (600 ml), and the mixture was stirred for 1.5 hours at room temperature. The reaction solution was filtered, and then the resultant was washed with methanol and ethyl acetate successively. The filtrate was concentrated, to which water was added, and then extracted with ethyl acetate. The organic layer, which was washed with a brine, was dried over anhydrous magnesium sulfate. After the solvent was evaporated, the residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1→1:1) to yield 6-ethynylbenzothiazole (30.0 g) as a light yellow solid (mp: 47.5-49.0° C.).

1. filtrationThe reaction solution was filtered
2. washthe resultant was washed with methanol and ethyl acetate successively
3. concentrationThe filtrate was concentrated, to which water
4. additionwas added
5. extractionextracted with ethyl acetate
6. washThe organic layer, which was washed with a brine
7. dry with materialwas dried over anhydrous magnesium sulfate
8. customAfter the solvent was evaporated
9. customthe residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1→1:1)