2-Methyl-4-(tributylstannyl)pyridine → N-[2,3'-Bipyridin]-6'-yl-2',3-dimethyl[2,4'-bipyridine]-5-acetamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a reaction tube were added 5 N-(2,3′-bipyridin-6′-yl)-2-(6-chloro-5-methylpyridin-3-yl)acetamide 124-2 (52 mg, 0.15 mmol), 2-methyl-4-(tributylstannyl)pyridine (115 mg, 0.3 mmol), and Pd(PPh3)4 (35 mg, 0.03 mmol). The tube was subjected to vacuum and back filled with argon. DMF (1.0 ml) was added and the mixture was heated in 118° C. oil bath overnight. After cooled to room temperature, the mixture was filtered through celite, washed and diluted with ethyl acetate (30 ml) and extracted with 0.1 N HCl solution (30 ml). The acidic aqueous phase was treated with Na2CO3 to have pH around 9 and extracted with ethyl acetate (3×20 ml). The combined organic phase was dried over Na2SO4 and concentrated by evaporation. The residue was subjected to silica gel column chromatography with 5% MeOH in DCM as eluent to give N-(2,3′-bipyridin-6′-yl)-2-(2′,3-dimethyl-2,4′-bipyridin-5-yl)acetamide 124 as white solid. MS m/z 396.3 (M+1); 1H NMR 400 MHz (CDCl3) δ 8.93-8.89 (m, 1H), 8.72˜8.67 (m, 1 H), 8.59 (d, 1 H), 8.51 (d, 1 H), 8.37˜8.29 (m, 2 H), 8.23 (bs, 1 H), 7.76(m, 1H), 7.71 (m, 1 H), 7.65 (d, 1 H), 7.33 (bs, 1 H), 7.30˜7.24 (m, 1 H), 3.81 (s, 2H), 2.63 (s, 3H), 2.38 (s, 3 H).

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