Triethylamine → 2-Fluoro-4-methoxy-3-(1,4,4,6-tetramethyl-2-oxo-1,2,3,4-tetrahydro-quinolin-7-yl)-benzaldehyde

関与物質

反応条件

反応手順

To a solution of 7-bromo-1,4,4,6-tetramethyl-3,4-dihydro- 1H-quinoline-2-one (example 1d) (0.96 g, 3.40 mmol) in dioxane (2 mL) were added under argon, triethylamine 1.9 mL, 13.61 mmol), palladium acetate (38 mg, 0.17 mmol), 2-(dicyclohexylphosphino) biphenyl (238 mg, 0.68 mmol) and pinacolborane (1M in THF, 10.2 mL, 10.2 mmol). The mixture was stirred at 80° C. for 1 hr 45 min, then cooled to room temperature. Water (1.5 mL), barium hydroxide octahydrate (3.22 g, 10.20 mmol) and 2-Fluoro-3-iodo-4-methoxy benzaldehyde dissolved in dioxane (7 mL) were successively added and the mixture heated at 100° C. for 13 hrs. The mixture was cooled to room temperature and filtered over celite. Brine was added and the aqueous layer was extracted with dichloromethane. The organic extract was washed successively with water and brine, dried over anhydrous magnesium sulfate, filtered and evaporated. The residue was purified on silica gel (20% to 30% ethyl acetate in hexane) to give 0.63 g of 2-Fluoro-4-methoxy-3-(1,4,4,6-tetramethyl-2-oxo-1,2,3,4-tetrahydro-quinolin-7-yl)-benzaldehyde (52%). 1H NMR (300 MHz; CDCl3): 1.33 (s, 3 H), 1.35 (s, 3 H), 2.09 (s, 3 H), 2.54 (s, 2 H), 3.35 (s, 3 H), 3.87 (s, 3 H), 6.79 (s, 1 H), 6.92 (d, J=8.7 Hz, 1 H), 7.21 (s, 1 H), 7.94 (t, J=8.7 Hz, 1 H), 10.25 (s, 1 H).

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