1,8-Diazabicyclo(5.4.0)undec-7-ene → 2-[2-(3,4-Difluorophenyl)ethyl]-4-fluorophenol

Participants

Reaction Conditions

Reaction Steps

610 mg of 3,4-difluorobenzaldehyde, 2000 mg of 5-fluoro-2-methoxymethoxybenzyltriphenylphosphonium chloride and 0.64 ml of DBU were allowed to react together in 20 ml of acetonitrile, subsequently treated, and purified by silica gel column chromatography, using a 15:1 by volume mixture of hexane and ethyl acetate as the eluent, in the same manner as described in Preparation 2, to give 1230 mg of an oily substance. This oily substance was dissolved in 10 ml of ethanol, and 300 mg of tris-(triphenylphosphine)rhodium(I) chloride were added to the resulting solution. The resulting mixture was then stirred under a hydrogen atmosphere at atmospheric pressure and at 60° C. for 14 hours. At the end of this time, the reaction solution was filtered with a Celite (trade mark) filter aid. The filtrate was concentrated by evaporation under reduced pressure, and allowed to adsorb on a silica gel column for some time. The filtrate was then allowed to elute slowly, using a 4:1 by volume mixture of hexane and ethyl acetate as the eluent, to give an eluate containing the title compound. This eluate was concentrated by evaporation under reduced pressure, and dried in vacuo, to give 1010 mg (yield 93%) of the title compound as a solid substance.

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