反应详情

4.45 g (18.0 mmol) 3-(4-trifluoromethylsulfanyl-phenyl)-acrylamide, 2.79 g (22.0 mmol) dichloro acetone and 50.0 ml toluene were kept at reflux temperature for 30 h with continuous removal of water by use of a Dean-Stark trap (a water separator used in chemical reactions). The reaction mixture was cooled for 30 min. in an ice bath and the precipitated amide (1.2 g) was removed by filtration and discarded. After removal of solvents in vacuo, the residue (5.92 g) 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, n-heptane added and the crystallized material isolated by filtration, washed with cold heptane and dried. 2.02 g (35%) 4-Chloromethyl-2-[2-(4-trifluoromethylsulfanyl-phenyl)-vinyl]-oxazole.

1. temperatureat reflux temperature for 30 h
2. customwith continuous removal of water by use of a Dean-Stark trap (a water
3. temperatureThe reaction mixture was cooled for 30 min. in an ice bath
4. customthe precipitated amide (1.2 g) was removed by filtration
5. customAfter removal of solvents in vacuo
6. customthe residue (5.92 g) was purified by chromatography on silica gel (eluent: heptane/ethyl acetate 1:1)
7. additionAll fractions containing the product
8. concentrationwere concentrated to a volume of 10 ml, n-heptane
9. additionadded
10. customthe crystallized material isolated by filtration
11. washwashed with cold heptane
12. customdried