反应详情

To 5 g of 1,2-bis-(bromomethyl)-4-fluoro-benzene in 100 ml of methylethylketone were added 14.7 g of potassium carbonate followed by 4.1 g of benzyl acetoacetate. The mixture was stirred for 16 h at ambient temperature. 100 ml of water were added. The phases were separated and the aqueous phase was extracted once with 50 ml of methylethylketone. The combined organic phases were evaporated to give 6.2 g of crude product as an oil. The crude product was crystallized from cold heptane and from cold methanol. Melt.p. 55° C. 1HNMR: δ=2.16 ppm (s, 3H); 3.50 ppm (AB, 2H); 3.53 ppm (AB, 2H); 5.22 (s, 2H); 6.88 ppm (m, 2H); 7.12 ppm (dd, 1H) 7.30-7.42 ppm (m, 5H).

1. customThe phases were separated
2. extractionthe aqueous phase was extracted once with 50 ml of methylethylketone
3. customThe combined organic phases were evaporated