[F:1][C:2]1[CH:22]=[CH:21][C:5]([CH2:6][CH2:7][C:8]2[CH:16]=[CH:15][C:11]([C:12](O)=[O:13])=[CH:10][C:9]=2[C:17]([O:19][CH3:20])=[O:18])=[CH:4][CH:3]=1.O1CCCC1.B>CO>[F:1][C:2]1[CH:22]=[CH:21][C:5]([CH2:6][CH2:7][C:8]2[CH:16]=[CH:15][C:11]([CH2:12][OH:13])=[CH:10][C:9]=2[C:17]([O:19][CH3:20])=[O:18])=[CH:4][CH:3]=1A mixture of 4-(4-fluorophenethyl)-3-methoxycarbonylbenzoic acid (16.5 g, 54.88 mmol), tetrahydrofuran (500 ml) and borane in tetrahydrofuran (1 M. complex, 218 ml, 218 mmol) was stirred under an inert atmosphere at reflux for 6 hours. The reaction was cooled to ambient temperature and methanol (1 L) was added. It was then evaporated to dryness to give a dark oil which was purified by flash chromatography using iso-hexane/ethyl acetate (1:1) as eluant to give as a clear gum methyl 2-(4-fluorophenethyl)-5-hydroxymethylbenzoate (13.10 g).
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