反应详情

To a solution of 2-cyano-6-hydroxybenzothiazole (0.39 g, 2.2 mmol) in acetone (50 mL) was added 3-(bromomethyl)pyridine hydrobromide (0.7 g, 2.76 mmol), cesium carbonate (2.15 g, 6.6 mmol), and a catalytic amount of sodium iodide. After adding 3 A molecular sieves, the yellow suspension was refluxed for 40 h under nitrogen. After cooling down the mixture and filtering the solids, the filtrate was concentrated and the residue was purified by silica gel chromatography using 50%-100% ethyl acetate in heptane. A yellowish solid was obtained in 61% yield. MS (ESI+): m/z 267.64 (M+H)+; calc'd: 268.05.

1. additionAfter adding 3 A molecular sieves
2. temperaturethe yellow suspension was refluxed for 40 h under nitrogen
3. temperatureAfter cooling down the mixture
4. filtrationfiltering the solids
5. concentrationthe filtrate was concentrated
6. customthe residue was purified by silica gel chromatography
7. customA yellowish solid was obtained in 61% yield