反应详情

温度

80 °C

The product from Example 45A (0.17 g, 1.5 mmol), ethyl 4-(acetyloxy)butanoate (0.28 g, 1.5 mmol), prepared as described in (Husband, et al., Tetrahedron (1995) 51(3), 865), and 3-bromo-4-fluorobenzaldehyde (0.3 g, 1.5 mmol) in ethyl alcohol (4 mL) were heated at 80° C. for 24 hours in a sealed tube. The reaction mixture was evaporated under reduced pressure and the residue chromatographed on silica gel eluting with 5% ethanol/methylene chloride to provide the title compound (0.2 g). 1H NMR (300 MHz, DMSO-d6) δ 1.03 (t, 3H), 2.1 (s, 3H), 3.23 (s, 3H), 3.82 (q, 2H), 4.8 (s, 1H), 5.12 (q, 2H), 7.25 (m, 1H), 7.3 (t, 1H), 7.48 (dd, 1H), 10.2 (s, 1H); MS (ESI−) m/z 467 (M−H)−.

1. customThe reaction mixture was evaporated under reduced pressure
2. customthe residue chromatographed on silica gel eluting with 5% ethanol/methylene chloride