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Reagents and conditions: (a)372 excess neat BBr3, 25 °C; (b) 1.5 equiv of MesLi, toluene/THF, 0 °C; (c) 1.1 equiv of [2,6-bis(propen-2-yl)phenyl]lithium, toluene/THF, 25 °C; (d) 1 equiv of Sc(OTf)3, 1,2-DCE, reflux temperature.
