Boron Trichloride → HCID 178463348、化合物

5-(Benzyloxy)-6-(N-ethylmethylsulfonamido)-2-(4-fluorophenyl)-N-methylpyrazolo[1,5-a]pyridine-3-carboxamide (2.5 g, 5 mmol, 1 eq) was dissolved in dichloromethane and cooled to −78° C. Tetrabutylammonium iodide (0.19 g, 0.5 mmol, 0.1 eq) was added to the above mixture followed by slow dropwise addition of BCl3 (25 ml) at −78° C. The above solution was stirred at room temperature for 14 h. The solution was quenched with 10% sodium bicarbonate solution and the product was extracted with dichloromethane. The dichloromethane solution was evaporated to get off-brown solid. Yield: 1.6 g (79%). 1HNMR (400 MHz, DMSO-d6): δ 1.08 (t, J=7.14 Hz, 3H), 2.71 (d, J=4.52 Hz, 3H), 3.11 (s, 3H), 3.62 (q, J=6.92 Hz, 2H), 7.14 (s, 1H), 7.30 (t, J=8.86 Hz, 2H), 7.57 (d, J=4.56 Hz, 1H), 7.81-7.82 (m, 2H), 8.72 (s, 1H), 11.32 (br s, 1H). LCMS: (ES+) m/z=407.0 (M+H).