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Reagents and conditions: (i) EtOH, reflux, 2 h. (ii) 2 M NaOH, 100 °C, MW, 30 min. (iii) DMF, MeI, 90 °C. (iv) BBr3 in CH2Cl2, MW, 120 °C, 30 min. (v) NaH, DMF, [18F]FEtTs, 90 °C, 5 min. (vi) NaH in DMF, F(CH2)2Br, 80 °C, 15 min. (vii) K2CO3 in DMF, ethylene glycol ditosylate, 100 °C, 15 min. (viii) DMF:CH3CN (1:5), [K+/2.2.2]18F–, 120 °C, 20 min.
