反应详情

To a solution of 1-bromo-4-fluorobenzene (28 g, 0.162 mol) in THF (90 mL) was added n-BuLi (70 mL, 2.5 M) at −78° C. and stirred for 1 h under nitrogen. Then to a premixed solution of CuCl (18 g, 0.16 mol) and LiCl (15 g, 0.354 mol) in THF (160 mL) at −78° C. was added the above solution quickly. The formed solution was stirred for 20 minutes, and was treated with crotonyl chloride (21 g, 0.176 mol). The resulting solution was stirred for 30 minutes. The mixture was quenched with aq NH4Cl, the organic phase was separated, concentrated to give the crude product which was purified by column chromatography to afford 1-(4-fluorophenyl)but-2-en-1-one (2.6 g, 10%). 1H NMR (400 MHz, CDCl3): δ=2.02 (d, 3H), 6.88 (m, 1H), 7.10 (m, 3H), 7.98 (m, 2H).

1. stirringThe formed solution was stirred for 20 minutes
2. stirringThe resulting solution was stirred for 30 minutes
3. customThe mixture was quenched with aq NH4Cl
4. customthe organic phase was separated
5. concentrationconcentrated
6. customto give the crude product which
7. customwas purified by column chromatography