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a) LiHMDS, DMPU, ethyl 2-bromoacetate, THF, −20 °C, 35 min, 77 %; b) i) 1 M (aq) LiOH, THF, RT, 16 h, ii) HBTU, 18, DMF, RT, 17 h, 60 %; c) TiCl4, CH2Cl2, 0 °C to RT, 16 h, 40 %; d) 21, TFA, dichloroethane, MWI: 120 °C, 3 min, 73 %; e) 0.1 M aqueous LiOH, THF, RT, 1 h; ii) AcOH, 91 %.
