Potential tumor- or organ-imaging agents. 29. Radioiodinated esters and amides of 20-hydroxy- and 20-aminopregn-5-en-3 beta-ols.

Abstract

Radioiodinated benzoyl esters and amides of epimeric 20-hydroxy- and 20-aminopregn-5-en-3 beta-ols were synthesized in an effort to find an agent that would be rapidly and selectively taken up by adrenal cortical tissue. Achievement of such a goal would provide a basis for the development of adrenal imaging agents superior to those currently available for clinical use. The iodobenzoyl derivatives were obtained by treating the appropriate epimer with 2-iodobenzoic acid in the presence of dicyclohexylcarbodiimide and 4-(dimethylamino)pyridine. The resulting esters and amides were readily labeled with radioiodine by isotope exchange with sodium iodide-125 in pivalic acid. Tissue distribution studies in female rats revealed that only the esters displayed appreciable adrenal specificity, and the ester having the same configuration at C-20 as cholesterol was significantly better than the corresponding C-20 epimer.

Cite this paper

@article{Haradahira1989PotentialTO, title={Potential tumor- or organ-imaging agents. 29. Radioiodinated esters and amides of 20-hydroxy- and 20-aminopregn-5-en-3 beta-ols.}, author={Terushi Haradahira and Susan W. Schwendner and Munekado Kojima and Raymond E. Counsell}, journal={Journal of medicinal chemistry}, year={1989}, volume={32 3}, pages={609-12} }