Toluene → N-(5-(3,4-dimethylphenyl)-6-(2,2,2-trifluoroethoxy)pyridin-3-yl)nicotinamide

関与物質

反応手順

In a 25 mL sealed tube N-(5-bromo-6-(2,2,2-trifluoroethoxy)pyridin-3-yl)nicotinamide (200 mg, 532 μmol) was combined with toluene (11 mL). Under argon atmosphere, were added 3.4-dimethylbenzeneboronic acid (160 mg, 1.06 mmol), an aqueous solution of sodium carbonate (2M, 0.53 mL) and Pd(dppf)2Cl2 (12 mg, 0.016 mmol). After two hours at 90° C., the dark red suspension was cooled to room temperature, diluted with ethyl acetate (10 mL), and washed with water (10 mL) and brine (10 mL). The aqueous layer was back-extracted with ethyl acetate (15 mL). The organic layers were dried over MgSO4 and concentrated in vacuo. Crystallization from ethyl acetate/heptane (5 mL, 1/2) gave a white solid (96 mg), the filtrate was evaporated to dryness and purified by column chromatography (silica gel, 20 g, 10% to 100% ethyl acetate in heptane) to get a second part of the desired product as a white solid (139 mg). Overall yield was 65%; MS (EI): 402.3 (M+H).

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