反应详情

A solution of 1-(3,4-dichlorophenyl)cyclobutanecarbonitrile (6.56 g) in toluene (100 ml) was added dropwise under nitrogen to a stirred solution of benzylmagnesium chloride [prepared in the usual manner from benzyl chloride (5 ml) and magnesium (1.08 g)] in ether (100 ml). When the addition was complete, ether was distilled from the mixture until the internal temperature rose to 95° C., then the mixture was stirred at this temperature for 19 h, cooled to ambient temperature, and quenched by the dropwise addition of water (30 ml) followed by concentrated hydrochloric acid (10 ml). The mixture was stirred at 95° C. for 2.5 hours, then it was cooled to ambient temperature. The organic phase was separated, washed with water (2×100 ml) and saturated brine (100 ml), dried (Na2SO4), and the solvent was removed in vacuo. The residue was purified via flash chromatography over silica using a 5:95 mixture of ethyl acetate and toluene as eluant. Appropriate fractions were combined and the solvents removed in vacuo to give 1-[1-(3,4-dichlorophenyl)cyclobutyl]-2-phenyl)ethanone]-2-phenylethanone as a colourless oil (5.08 g) which solidified slowly at ambient temperature to give a colourless solid, m.p. 53-55° C.

1. additionWhen the addition
2. distillationether was distilled from the mixture until the internal temperature
3. customrose to 95° C.
4. customquenched by the dropwise addition of water (30 ml)
5. stirringThe mixture was stirred at 95° C. for 2.5 hours
6. temperatureit was cooled to ambient temperature
7. customThe organic phase was separated
8. washwashed with water (2×100 ml) and saturated brine (100 ml)
9. dry with materialdried (Na2SO4)
10. customthe solvent was removed in vacuo
11. customThe residue was purified via flash chromatography over silica using
12. additiona 5:95 mixture of ethyl acetate and toluene as eluant
13. customthe solvents removed in vacuo