反应详情

A solution of N-(2,2,2-trifluoroethyl)-4-chlorobenzimidoyl chloride (10.2 g, 0.04 mol) and methyl 2-chloroacrylate (5.8 g, 0.048 mol) in N,N-dimethylformamide is treated with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 19.5 g, 0.128 mol) over 30 minutes at such a rate that the temperature is kept at 40° C., stirred for two hours, and quenched with water and ethyl acetate. The organic layer is separated, washed sequentially with aqueous HCl and water, and concentrated in vacuo to obtain an oil. Flash column chromatography of the oil using silica gel and a 20% ethyl acetate in heptane solution and crystallization from heptane gives the title product as white crystals (4.2 g, 34.6% yield, mp 120.0°-122.5° C.).

1. customis kept at 40° C.
2. customquenched with water and ethyl acetate
3. customThe organic layer is separated
4. washwashed sequentially with aqueous HCl and water
5. concentrationconcentrated in vacuo
6. customto obtain an oil
7. customa 20% ethyl acetate in heptane solution and crystallization from heptane