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Synthetic route to the target compounds and their 67/68Ga analogues.
Reagents and Conditions: (i-A) PyBOP, Et3N, DMF, DCM, RT overnight; (i-B) EDCi, HOBt, DIPEA, DMF, 0 °C, 2h, RT overnight; (ii-A&B) CF3COOH, RT, 2hr (iii-A&B) DIPEA, ACN, DMSO, RT overnight; (iv-A&B) natGa(NO3)3·8 H2O, NH4OAc, H2O, 3 h, 80 °C or 67GaCl3, HEPES, HCl, H2O, 10 min 95 °C or [68Ga(OH)4]−, HEPES, HCl, H2O, 10 min 95 °C.
