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General syntheses of precursors 27a–d and radiotracers [18F]10a, [18F]17a, [18F]17b, and (±)-[18F]24. Reagents and conditions: (a) 4-Hydroxy-3-(trifluoromethyl)benzoic acid, TBTU, HOBt, DIPEA, DMF, RT–120 °C; (b) ethylene ditosylate, K2CO3, CH3CN, 90 °C; (c) [18F]KF, Kryptofix 222, K2CO3, CH3CN, 110 °C, 15 min, 6 N HCl, 5 min.
