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Reagents and conditions: (a) BrCH2COOC2H5, K2CO3, acetone, DMF, 60 °C; (b) DBU, toluene, 80 °C; (c) NBS, AIBN, CCl4, 90 °C; (d) (C2H5OCO)2CH2, NaH, DMF, THF, 70 °C; (e) HCl, HOAc, H2O, 100 °C; (f) C2H5B(OH)2, Pd(OAc)2, t-Bu3PHFP4, K3PO4(aq), toluene, 90 °C.
