反应详情

Finally, pure 2-mercapto-6-methoxybenzoxazole (4.0 g, 22.2 mmol) was dissolved in thionyl chloride (15 mL). DMF (1 mL) was added to the solution and the reaction mixture was stirred at r.t for 10 min. The solvent was removed under reduced pressure. The crude product was dissolved in ethyl acetate, washed with water, dried over Na2SO4, and concentrated to give crude 2-chloro-6-methoxybenzoxazole, which was purified by chromatography with petroleum ether/ethylacetate (3:1 v/v) to afford 2-chloro-6-methoxybenzoxazole, compound 25, (3.7 g, yield 92%).

1. customThe solvent was removed under reduced pressure
2. dissolutionThe crude product was dissolved in ethyl acetate
3. washwashed with water
4. dry with materialdried over Na2SO4
5. concentrationconcentrated
6. customto give crude 2-chloro-6-methoxybenzoxazole, which
7. customwas purified by chromatography with petroleum ether/ethylacetate (3:1 v/v)