[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[Mg]Br.[CH2:11]1[C:13]23[CH2:15][C:12]12[CH2:14]3>>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[C:12]12[CH2:15][CH:13]([CH2:14]1)[CH2:11]2Reaction of 2-methoxyphenylmagnesium bromide with [1.1.1]propellane (see A. B. Shtarev et al., J. Am. Chem. Soc. 2001, 123, 3484-3492) afforded 1-(2-methoxyphenyl)bicyclo[1.1.1]pentane, which was treated with boron tribromide to provide the requisite phenol.
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