Potassium Carbonate → N-Cyclopropyl-4-[8-(methylsulfanyl)-6-phenylimidazo[1,2-a]pyrazin-3-yl]benzamide

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Reaction Conditions

Reaction Steps

To a stirred solution of 4-(6-bromo-8-methylsulfanyl-imidazo[1,2-a]pyrazin-3-yl)-N-cyclopropyl-benzamide (7.34 g, 18.2 mmol) in n-propanol (270 mL) and NMP (15 mL) was subsequently added 27.3 mL 2M potassium carbonate solution, 4.44 g phenylboronic acid (36.4 mmol, 2 eq), triphenylphosphine (238.7 mg, 0.91 mmol, 0.05 eq), 1.28 g bis(triphenylphosphin)palladium(II)chloride (1.82 mmol, 0.1 eq) in one portion at rt under argon atmosphere. After stirring for 2 h at 120° C., the mixture was concentrated in vaccuo (50% v/v), triturated with water and extracted with DCM. The organic phase was dried over sodium sulphate, filtered and the solvent was evaporated. Purification by flash chromatography (ethyl acetate/n-hexane) followed by crystallization from ethyl acetate yielded 5.87 g (80.5%)N-Cyclopropyl-4-(8-methylsulfanyl-6-phenyl-imidazo[1,2-a]pyrazin-3-yl)-benzamide: 1H-NMR (300 MHz, CDCl3): δ=8.30 (1H, s), 7.94 (4H, d), 7.77 (1H, s), 7.65 (2H, d), 7.50-7.37 (3H, m), 6.38 (1H, bs), 2.95 (1H, m), 2.80 (3H, s), 1.04 (6H, d), 0.92 (2H, m), 0.67 (2H, m) ppm.

Provenance & Evidence