反应详情

To a stirred suspension of trimethylsulfoxonium iodide (435 mg, 2.06 mmol) in dimethylsulfoxide-THF (3 ml-2 ml) was added potassium t-butoxide (231 mg, 2.06 mmol) in one portion at ambient temperature. After 30 min. at same temperature, to this (colorless solution) was added a solution of methyl 2-isopropenylquinoline-6-carboxylate (312 mg, 1.37 mmol) in THF (3 ml) at room temperature. The mixture was stirred at room temperature for 40 min then 1 hour at 60° C. The mixture was quenched with water and diluted with ethyl acetate-toluene (8:1) (90 ml). The organic solution was separated and washed with water (×2), brine, dried over sodium sulfate and concentrated in vacuo to crude product. The crude product was purified by column chromatography on silica gel (250 g) with hexane-ethyl acetate (10:1) to furnish the title compound (225 mg, 68%) as a white solid. 1H NMR (270 MHz, CDCl3) δ ppm 0.91-0.98 (2H, m), 1.38-1.45 (2H, m), 1.64 (3H, s), 3.98 (3H, s), 7.42-7.48 (1H, m), 7.97-8.27 (3H, m), 8.50-8.55 (1H, m). MS (ESI): m/z 242.15 (M+H)+.

1. custom1 hour
2. customat 60° C
3. customThe mixture was quenched with water
4. additiondiluted with ethyl acetate-toluene (8:1) (90 ml)
5. customThe organic solution was separated
6. washwashed with water (×2), brine
7. dry with materialdried over sodium sulfate
8. concentrationconcentrated in vacuo to crude product
9. customThe crude product was purified by column chromatography on silica gel (250 g) with hexane-ethyl acetate (10:1)