(18)F-labelling of A-ring substituted 16alpha-fluoro-estradiols as potential radiopharmaceuticals for PET imaging.
The 2-methoxy derivative of estradiol is currently in Phase II clinical trial as an anticancer agent while the 4-methyl derivative has been shown to interact with cytoplasmic and nuclear estrogen receptors in rat pituitary gland and hypothalamus. We hypothesize that the 16alpha-(18)F-analogs of these estrogens could be suitable radiotracers to evaluate action mechanisms of the parent compounds. In this study we report the synthesis of the 16alpha-(18)F and 16alpha-(19)F-analogs of the A-ring substituted estradiols in high yield via stereoselective opening of the intermediate 16beta,17beta-O-cyclic sulfones with [(18)F]F(-) or F(-) followed by deprotection.
Department of Nuclear Medicine and Radiobiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada J1H 5N4.
Naseem
N
Ahmed
Guillaume
G
Garcia
Hasrat
H
Ali
Johan E
JE
van Lier
D004958:Estradiol / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D007553:Isotope Labeling / Q000379:methods; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals / Q000138:chemical synthesis* / Q000737:chemistry*
D019275:Radiopharmaceuticals; D004958:Estradiol; C043436:16-fluoroestradiol