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Reagents and conditions: (a) (1) SOCl2, toluene, reflux, 3 h; (2) BF3·OEt2, ClCH2CH2Cl anh., 60 °C, 16 h; (b) (1) SOCl2, toluene, reflux, 3 h; (2) TfOH, ClCH2CH2Cl anh., 60 °C, 1 h; (c) BBr3, anh. CH2Cl2, 4 °C, 48 h; (d) TFAA, TfOH, ClCH2CH2Cl anh, 15 min, rt.
