反应详情

To a solution of 3-(2-(2,2-dimethyltetrahydro-2H-pyran-4-yl)-4-oxochroman-6-yl)benzonitrile (251 mg, 0.69 mmol) in anhydrous DCM (15 mL) under N2 atmosphere was added 1 M TiCl4 (in DCM, 1.4 mL, 1.4 mmol) dropwise within 5 min at room temperature. It was stirred another 1 h after the addition. To this mixture was added Bis-trimethylsilylcarbodiimide (283 mg, 340 μL 1.52 mmol) dropwise. The resulting mixture was stirred for another 20 h after the addition. The reaction mixture was poured into ice-water (20 g), It was transferred to a separating funnel after stirred for 30. The separated aqueous phase was extracted with DCM (2×20 mL). The combined organic phases were dried over anhydrous Na2SO4, and filtered, and concentrated to give yellowish gel like solid (E)-N-(6-(3-cyanophenyl)-2-(2,2-dimethyltetrahydro-2H-pyran-4-yl)chroman-4-ylidene)cyanamide (276 mg), which was used for next step without further purification. MS ESI +ve m/z 386 (M+H)+.

1. additionafter the addition
2. stirringThe resulting mixture was stirred for another 20 h
3. additionafter the addition
4. customwas transferred to a separating funnel
5. stirringafter stirred for 30
6. extractionThe separated aqueous phase was extracted with DCM (2×20 mL)
7. dry with materialThe combined organic phases were dried over anhydrous Na2SO4
8. filtrationfiltered
9. concentrationconcentrated