反应详情

A solution of N-(2′,4′-difluoro-5-(5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-benzo[d]imidazol-1-yl)-[1,1′-biphenyl]-3-yl)cyclopropanesulfonamide (0.15 g, 0.272 mmol) in 1,2-dimethoxyethane (5 ml) was degassed by N2 bubbling for 5 min. 2-Bromo-5-fluoropyridine (0.057 g, 0.326 mmol, 1.2 eq.) was added and the mixture was degassed for another 5 min. Pd(dppf)Cl2 (0.011, 0.013 mmol, 0.05 eq.) and aqueous sodium carbonate (0.072, 0.680 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 title product in 14.1% yield (0.02 g). 1H NMR (400 MHz, DMSO-d6): δ 10.23 (s, 1H), 8.75 (s, 1H), 8.68-8.67 (d, 1H), 8.48 (d, 1H), 8.20-8.13 (m, 2H), 7.86-7.743 (m, 3H), 7.61-7.60 (d, 2H), 7.51-7.43 (m, 2H), 7.30-7.25 (m, 1H), 2.89-2.86 (t, 1H), 1.03-1.02 (d, 4H); LC-MS (ESI): Calculated mass: 520.53; Observed mass: 521.2 [M+H]+ (rt: 1.64 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)