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Reagents and conditions: (i) alkylating agent (1.3 equiv), NaH (1.1 equiv), DMF, overnight, rt; (ii) 2-fluoroethyl azide (1.3 equiv), CuSO4 (0.05 equiv), sodium ascorbate (0.1 equiv), DMF, 4 h, rt; (iii) K222/K2CO3 (30:15 mM), [18F]fluoride, 15 min, 80 °C.
