反应详情

A 1M solution of boron tribromide in dichloromethane (50 cm3) is added dropwise to a solution of 2-(4-ethoxyphenyl)-5-octylthiazole [J. prakt. Chem., (1979) Vol. 321, pp 643](2.0 g) and dichloromethane (50 cm3) at 0° C. under an atmosphere of nitrogen. The reaction solution is stirred overnight and water (100 cm3) added. The organic layer is separated off and the aqueous layer extracted with dichloromethane (2×100 cm3). The combined organic layers are washed with brine (2×100 cm3) and then dried (MgSO4), filtered and evaporated down. The residue is purified by column chromatography on silica gel using a 9:1 hexane/ethyl acetate mixture as eluent and recrystallisation from ethanol to yield 1.0 9 of g 2-(4-hydroxyphenyl)-5-octylthiazole.

1. customat 0° C.
2. customThe organic layer is separated off
3. extractionthe aqueous layer extracted with dichloromethane (2×100 cm3)
4. washThe combined organic layers are washed with brine (2×100 cm3)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. customevaporated down
8. customThe residue is purified by column chromatography on silica gel using a 9:1 hexane/ethyl acetate mixture as eluent
9. customrecrystallisation from ethanol