反应详情

1,3-Dihydro-benzimidazole-2-thione (1.0 g, 6.66 mmol) is suspended into 50 mL of tetrahydrofuran under argon. Then, 479 mg (9.99 mmol) of sodium hydride is added. The reaction mixture is stirred at room temperature until gas evolution has ceased. 2-Chloro-1,3-thiazole-5-carbaldehyde (983 mg, 6.66 mmol) is then added and the reaction mixture is stirred at room temperature for 2 h, upon which it is filtered. The solid is washed with tetrahydrofuran and dried under reduced pressure. The residue is diluted with water and extracted twice with ethyl acetate and once with dichloromethane. The organic extracts are combined, dried on magnesium sulfate, filtered and concentrated under reduced pressure. 1.23 g of 2-(1H-benzimidazol-2-ylsulfanyl)-thiazole-5-carbaldehyde is obtained as a pale yellow powder. mp: 188° C.

1. stirringthe reaction mixture is stirred at room temperature for 2 h, upon which it
2. filtrationis filtered
3. washThe solid is washed with tetrahydrofuran
4. customdried under reduced pressure
5. additionThe residue is diluted with water
6. extractionextracted twice with ethyl acetate and once with dichloromethane
7. customdried on magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure