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.