Sodium Carbonate → tert-butyl(1-(4-(1-methyl-2-oxo-7-phenyl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-6-yl)phenyl)cyclopropyl)carbamate

Participants

Reaction Conditions

Reaction Steps

In a 15 mL reaction tube was added 6-bromo-1-methyl-7-phenyl-1H-pyrido[2,3-b][1,4]oxazin-2(3H)-one (40 mg, 0.125 mmol) and tert-butyl(1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)cyclopropyl)carbamate (54 mg, 0.150 mmol) in 1,4-dioxane (1 ml), followed by a solution of sodium carbonate (40 mg, 0.3 mmol) in water (0.25 ml) to give a white suspension. This was degassed by bubbling nitrogen for 10 minutes, followed by the addition of [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II)dichloromethane adduct (9 mg, 0.013 mmol). The reaction mixture was heated to 80° C. overnight. The reaction mixture was allowed to cool to room temperature, diluted with brine (4 ml) and extracted into ethyl acetate (3×4 ml). The combined organic phases were dried over Na2SO4, filtered and concentrated to dryness under reduced pressure. The residue was purified by Biotage chromatography (cyclohexane:ethyl acetate, gradient elution from 90:10 to 20:80) to give the desired product as a white solid (60 mg, quantitative yield). 1H-NMR (500 MHz, CDCl3) δ 7.14-7.26 (6H, m), 7.08-7.14 (2H, m), 6.93 (2H, d), 4.99-5.27 (1H, br m), 4.80 (2H, s), 3.31 (3H, s), 1.35 (9H, br s), 1.25 (2H, br s), 1.03 (2H, br s). LCMS (Method D): RT=1.44 min, M+H+=472.20.

Provenance & Evidence