反应详情

4.45 g (18.0 mmol) 3-(4-Trifluoromethylsulfanyl-phenyl)-acrylamide, 2.80 g (22.2 mmol) 1,3-dichloroacetone and 50.0 ml toluene were kept at reflux temperature for 40 h with continuous removal of water by use of a Dean-Stark trap. After removal of solvents in vacuo, the residue was purified by chromatography on silica gel (eluent: heptane/ethyl acetate 1:1). All fractions containing the product were concentrated to a volume of 10 ml and the crystallized material isolated by filtration, washed with cold heptane and dried. Yield 2.02 g (35%) 4-Chloromethyl-2-[2-(4-trifluoromethylsulfanyl-phenyl)-vinyl]-oxazole.

1. temperatureat reflux temperature for 40 h
2. customwith continuous removal of water by use of a Dean-Stark trap
3. customAfter removal of solvents in vacuo
4. customthe residue was purified by chromatography on silica gel (eluent: heptane/ethyl acetate 1:1)
5. additionAll fractions containing the product
6. concentrationwere concentrated to a volume of 10 ml
7. customthe crystallized material isolated by filtration
8. washwashed with cold heptane
9. customdried