反应详情

A solution of N-(5-(6-bromo-3H-imidazo[4,5-b]pyridin-3-yl)-2′,4′-difluoro-[1,1′-biphenyl]-3-yl)ethanesulfonamide (0.2 g, 0.405 mmol) in 1,2-dimethoxyethane (5 ml) was degassed by N2 bubbling for 5 min. 1-Isopropyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.191 g, 0.810 mmol, 2.0 eq.) was added and the mixture was degassed for another 5 min. Pd(dppf)Cl2 (0.032 g, 0.040 mmol, 0.1 eq.) and aqueous sodium carbonate (0.17 g, 1.012 mmol, 2.5 eq.) were added and the procedure of Example 1(d) was followed. The crude residue of the product was purified by column chromatography (60-120 silica gel, 80% ethyl acetate in hexane) to yield the product in 52.1% yield (0.11 g). 1H NMR (400 MHz, DMSO-d6): δ 10.42 (s, 1H), 8.94 (s, 1H), 8.75 (d, 1H), 8.44-8.42 (dd, 2H), 8.05 (s, 1H), 7.95 (s, 1H), 7.77-7.70 (m, 2H), 7.48-7.43 (m, 2H), 7.30-7.26 (m, 1H), 4.54-4.51 (m, 1H), 4.13-4.11 (m, 1H); 3.28-3.26 (m, 2H), 3.17-3.16 (d, 1H), 1.48-1.46 (d, 6H), 1.28-1.25 (t, 3H), LC-MS (ESI): Calculated mass: 522.57 Observed mass: 523.0 [M+H]+ (rt: 1.52 min).

1. customthe mixture was degassed for another 5 min
2. customThe crude residue of the product was purified by column chromatography (60-120 silica gel, 80% ethyl acetate in hexane)
3. customto yield the product in 52.1% yield (0.11 g)
4. custom523.0 [M+H]+ (rt: 1.52 min)