反应详情

A solution of methylmagnesium bromide (17.6 mL of 1.4 M in toluene, 24.7 mmol) was added at <10° C. to a solution of quinoline-2-carboxaldehyde (3.0 g, 19 mmol) in anhydrous tetrahydrofuran (50 mL). The mixture was stirred at RT for 1 h and poured into saturated aqueous ammonium chloride (100 mL), and the resulting mixture was extracted with ethyl acetate (3×150 mL). The extracts were dried, concentrated, and the residue chromatographed on silica eluted with 30% and 40% ethyl acetate-hexanes giving a yellow solid. Yield 2.46 g, 75%. 1H NMR (CDCl3, 400 mHz) δ 8.15 (d, 1H, J=8.7 Hz), 8.07 (d, 1H, J=8.7 Hz), 7.81 (dd, 1H, J=1, 8 Hz), 7.71 (ddd, 1H, J=1, 7, 8.5 Hz), 7.51 (ddd, 1H, J=1, 7, 8.3 Hz), 7.33 (d, 1H, J=8.3 Hz), 5.07-4.99 (m, 2H), 1.56 (d, 3H, J=6.2 Hz).

1. extractionthe resulting mixture was extracted with ethyl acetate (3×150 mL)
2. customThe extracts were dried
3. concentrationconcentrated
4. customthe residue chromatographed on silica
5. washeluted with 30% and 40% ethyl acetate-hexanes giving a yellow solid