Ethyl Acetate → 4-[6-Bromo-8-(methylsulfanyl)imidazo[1,2-a]pyrazin-3-yl]-N-cyclopropylbenzamide

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Reaction Conditions

Reaction Steps

To a stirred solution of intermediate example 3-1 6-bromo-3-iodo-8-methylsulfanyl-imidazo[1,2-a]pyrazine (25.00 g, 67.6 mmol) in THF (214 mL) and water (100 mL) was subsequently added 43 g tripotassium phosphate (203 mmol, 3 eq), 18.01 g [4-[(cyclopropylamino)carbonyl]phenyl]-boronic acid (87.8 mmol, 1.3 eq) and 5.52 g Pd(dppf)Cl2 (6.8 mmol, 0.1 eq) in one portion at rt under argon atmosphere. After stirring overnight at 45° C., ethyl acetate was added and the organic phase was washed with sat. sodium chloride solution, dried over sodium sulphate and filtered. After removal of the solvent, purification by flash chromatography (n-hexane/ethyl acetate 85:15) yielded 15.33 g (56.26%) 4-(6-bromo-8-methylsulfanyl-imidazo[1,2-a]pyrazin-3-yl)-N-cyclopropyl-benzamide: 1H-NMR (300 MHz, CDCl3): δ =8.07 (1H, s), 7.92 (2H, d), 7.77 (1H, s), 7.60 (2H, d), 6.32 (1H, bs), 2.95 (1H, m), 2.70 (3H, s), 0.92 (2H, m), 0.67 (2H, m) ppm. UPLC-MS: RT=1.12 min; m/z 404.3 [MH+]; required MW=403.3.

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