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Synthetic route of the CNGU ligand. Reagents and conditions: (a) Triphosgene, TEA, CH2Cl2, −80 °C to r.t.,10 h; (b) H2, Pd/C, MeOH, r.t., 16 h; (c) TFA: CH2Cl2= 1:1; (d) Formic acid, DMF, 110 °C, 7 h; (e) 2,3,5,6-tetrafluorophenol, DCC, DMF, r.t., 8 h; (f) Burgess reagent, CH2Cl2, r.t., 7 h; (g) TEA, CH3OH, r.t., 24 h.
