1,4-Dioxane → 5-[4-(6,6-Dimethyl-5,6,7,8-tetrahydroquinazolin-4-yl)-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl]-3-nitropyridin-2-amine

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-amino-5-bromo-3-nitropyridine (0.31 g, 1.4 mmol [4-(6,6-dimethyl-5,6,7,8-tetrahydroquinazolin-4-yl)-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl]boronic acid (0.50 g, 1.4 mmol), [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) (103 mg, 0.1 mmol), diisopropylethylamine (0.94 g, 7.1 mmol), 1,4-dioxane (20 mL), and water (2 mL) was stirred at 90° C. for 4 hours. The reaction mixture was cooled, diluted with ethyl acetate (100 mL) then filtered through celite. The filtrate was washed with 50 mL portion each of 5% aqueous citric acid, water, then brine solution, dried over sodium sulfate, filtered and concentrated to give a brown solid residue. It was washed with 35% ethyl acetate-hexane to give 5-[4-(6,6-dimethyl-5,6,7,8-tetrahydroquinazolin-4-yl)-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl]-3-nitropyridin-2-amine (0.63 g, 97% yield). MS (EI) for C24H26N6O3: 447 (MH+).

Provenance & Evidence