Potassium Carbonate → tert-butyl 7-[2-(acetylamino)-1,3-thiazol-5-yl]-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of N-(5-bromo-1,3-thiazol-2-yl)acetamide (1.00 g, 4.5 mmol), (4-{[(1,1-dimethylethyl)oxy]carbonyl}-2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl)boronic acid (example 1, step 2) (1.59 g, 5.4 mmol), potassium carbonate (2.50 g, 18 mmol), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (0.33 g, 0.45 mmol), 1,4-dioxane (20 mL), and water (2 mL) was degassed with nitrogen for 2 min, and then stirred at 95° C. for 16 h. The reaction mixture was cooled, diluted with ethyl acetate (100 mL), and filtered through celite. The filtrate was washed with brine (2×30 mL), dried over sodium sulfate, and concentrated. Column chromatography on silica (gradient 20-85% ethyl acetate in hexane) gave 1,1-dimethylethyl 7-[2-(acetylamino)-1,3-thiazol-5-yl]-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (0.99 g, 56% yield). MS (EI) for C19H23N3O4: 390 (MH+).

Provenance & Evidence