反应详情

To a suspension of [8-(4-methanesulfonyl-phenyl)-[1,2,4]triazolo[1,5-a]pyridin-2-yl]-(4-methoxy-phenyl)-amine (150.0 mg, 0.3803 mmol) in dichloromethane (10 mL, was added dropwise 1.0 M of boron tribromide in dichloromethane (1.2 mL, 1.2 mmol). The mixture was stirred for 1 hour at room temperature then methanol (5 mL) was added slowly. The mixture was evaporated to dryness. Additional methanol (10 mL) was added and the mixture was evaporated to dryness. The brown solid was suspended in saturated sodium bicarbonate (10 mL) and extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over magnesium sulfate, filtered and evaporated to a solid. 4-[8-(4-Methanesulfonyl-phenyl)-[1,2,4]triazolo[1,5-a]pyridin-2-ylamino]-phenol was isolated without further purification as a light brown solid (0.115 g, 80%). 1H NMR (400 MHz, CDCl3, δ, ppm): 8.47 (dd, J=6.7, 0.9 Hz, 1H), 8.22 (d, J=8.4 Hz, 2H), 8.08 (d, J=8.5 Hz, 2H), 7.64 (dd, J=7.4, 0.8 Hz, 1H), 7.44 (d, J=8.7 Hz, 2H), 7.00 (dd, J=7.1, 7.1 Hz, 1H), 6.84 (d, J=8.6 Hz, 2H), 6.73 (s, 1H), 4.72 (br s, 1H), 3.09 (s, 3H). MS=381 (MH)+.

1. customThe mixture was evaporated to dryness
2. additionAdditional methanol (10 mL) was added
3. customthe mixture was evaporated to dryness
4. extractionextracted with ethyl acetate (3×20 mL)
5. dry with materialThe combined organic layers were dried over magnesium sulfate
6. filtrationfiltered
7. customevaporated to a solid