A solution of 6-bromo-2-methyl-1-({[2-(trimethylsilyl)ethyl]oxy}methyl)-1H-imidazo[4,5-b]pyridine (reagent preparation 35) (0.43 g, 1.30 mmol), [4-(6,6-dimethyl-5,6,7,8-tetrahydroquinazolin-4-yl)-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl]boronic acid (reagent preparation 23) (0.45 g, 1.30 mmol) and N,N-diisopropylethylamine (1.10 mL, 6.50 mmol) in N,N-dimethylformamide (4 mL), and water (1 mL) was degassed by bubbling nitrogen gas for five minutes followed by the addition of [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (52 mg, 0.065 mmol), then stirred at 95° C. for 16 hours. The reaction mixture was cooled to room temperature, diluted with ethyl acetate (100 mL), and filtered through a pad of Celite. The filtrate was washed with 1M aqueous lithium chloride (50 mL) and brine, dried over sodium sulfate, filtered and concentrated. Column chromatography on silica (gradient 1-2% 7N ammonia in methanol in chloroform) gave 4-(6,6-dimethyl-5,6,7,8-tetrahydroquinazolin-4-yl)-7-[2-methyl-1-({[2-(trimethylsilyl)ethyl]oxy}methyl)-1H-imidazo[4,5-b]pyridin-6-yl]-2,3,4,5-tetrahydro-1,4-benzoxazepine (0.54 g, 73% yield). MS (EI) for C32H42N6O2Si: 571 (MH+).
