1,4-Dimethyl-5-(tributylstannyl)-1H-1,2,3-triazole → {[2-(benzyloxy)-4,6-dimethylpyridin-3-yl]methyl}-5,8-dichloro-7-(1,4-dimethyl-1H-1,2,3-triazol-5-yl)-3,4-dihydroisoquinolin-1(2H)-one

関与物質

反応条件

反応手順

To a mixture of 2-{[2-(benzyloxy)-4,6-dimethylpyridin-3-yl]methyl}-7-bromo-5,8-dichloro-3,4-dihydroisoquinolin-1(2H)-one (253 g, 500 mg, 0.96 mmol), and 1,4-dimethyl-5-(tributylstannanyl)-1H-1,2,3-triazole (CAS: 1047637-17-1, 754 mg, 1.95 mmol) in a microwave tube was added 1,4-dioxane (10 mL), copper (I) iodide (28 mg, 0.14 mmol) and tetrakis(triphenylphosphine)palladium(0) (160 mg, 0.14 mmol). The solution was degassed using a stream of argon gas and degassing was continued for 10 minutes. The microwave vial was sealed and the mixture was heated at 125° C. for 2 hours under microwave irradiation. TLC (petroleum ether/ethyl acetate=1:1, Rf: 0.5) showed about 50% of 253g remained. However, further heating did not prove fruitful. The mixture was diluted with methyl tert-butyl ether (100 mL), washed with water (3×100 mL), dried over sodium sulfate and concentrated to dryness. The residue was purified by flash chromatography eluting with petroleum ether/ethyl acetate=1:1 to yield -{[2-(benzyloxy)-4,6-dimethylpyridin-3-yl]methyl}-5,8-dichloro-7-(1,4-dimethyl-1H-1,2,3-triazol-5-yl)-3,4-dihydroisoquinolin-1(2H)-one (229a, 108 mg, 21% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6): δ 7.76 (s, 1H), 7.44 (d, J=1.35 Hz, 2H), 7.28-7.34 (m, 3H), 6.75 (s, 1H), 5.38 (s, 2H), 4.71 (s, 2H), 3.77 (s, 3H), 3.30-3.34 (m, 2H), 2.82 (s, 2H), 2.35 (s, 3H), 2.32 (s, 3H), 2.08 (s, 3H) MS: 446.1 [M+1].

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