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Syntheses of radiolabelling precursors 25 and 26: a) NaBH(OAc)3, CH2Cl2, 23 °C, 18 h, 74 %; b) KHMDS, THF, 23 °C, 1.5 h; c) ZnCl2, Et2O, reflux, 5 days, 85 % (over two steps); d) NaOH, H2O, EtOH, 80 °C, 18 h; e) HOBt, EDCI, 23 °C, 48 h; f) H2, Pd/C, MeOH, Et3N, 23 °C, 18 h; g) H2, Pd/C, MeOH, 23 °C, 18 h.
