Scheme 2From: Synthesis of a benzoxazinthione derivative of tanaproget and pharmacological evaluation for PET imaging of PR expressionRadiosynthesis of [18F]2; Reaction conditions: (i) K[18F]fluoride/K2.2.2, K2CO3, DMSO, 160 °C 15 min; (ii) Lawessons reagent (15 mg), toluene, 135 °C, 35 minBack to article page