Synthesis and evaluation of (17.alpha.,20E)-21-[125I]iodo-19-norpregna-1,3,5(10),20-tetraene-3,17-diol and (17.alpha.,20E)-21-[125I]iodo-11.beta.-methoxy-19-norpregna-1,3,5(10),20-tetraene-3,17-diol [17.alpha.-iodovinyl)estradiol derivatives] as high specific activity potential radiopharmaceuticals
作者:Iwao Nakatsuka、Nelson L. Ferreira、W. C. Eckelman、B. E. Francis、W. J. Rzeszotarski、R. E. Gibson、E. M. Jagoda、R. C. Reba
DOI:10.1021/jm00376a010
日期:1984.10
Two 17 alpha-[125I]iodovinyl estradiol derivatives 4b,d possessing high specific activity have been prepared and tested as potential radiopharmaceuticals. The use of the 3-acetyl derivatives 2c,e and the replacement of iodine monochloride with sodium iodide and Chloramine-T in THF/phosphate buffer (pH 7.0) permitted us to synthesize no-carrier-added (17 alpha,20E)-21-[125I]iodo-19-norpregna-1,3,5(10),20-tetraene-3,17-d iol (4b) and (17 alpha,20E)-21-[125I]iodo-11 beta-methoxy-19-norpregna-1,3,5(10),20-tetraene-3,17-diol (4d) with 50% radiochemical yield and high purity. Although the specific activity represents only half of the theoretical value in some cases, this modified approach is a substantial improvement over the previously published method. Our preliminary distribution studies indicate that although both 4b and 4d localize in the tissues known to have a large concentration of estrogen receptors, 4d accumulates in higher amounts in target tissues and provides a high target to nontarget ratio.
Synthesis, receptor binding, and tissue distribution of 7.alpha.- and 11.beta.-substituted (17.alpha.,20E)- and (17.alpha.,20Z)-21-[125I]iodo-19-norpregna-1,3,5(10),20-tetraene-3,17-diols
作者:H. Ali、J. Rousseau、M. A. Ghaffari、Johan E. Van Lier
DOI:10.1021/jm00106a054
日期:1991.2
configuration. The 20Z isomers 6 exhibited slightly higher receptor binding affinities than the 20E isomers 3, with all eight isomeric products giving relative binding affinity values in the 20-50 range. The 11 beta- and 7 alpha-substituted (iodovinyl)estradiols gave substantially higher estrogen receptor-mediated uterusuptake as compared to the nonsubstituted parent molecule. Synergism between the effect of
(17α,20E)-和(17α,20Z)-(碘乙烯基)雌二醇3和6的11个β-甲氧基,11个β-乙氧基和7个α-甲基衍生物,以及未加载体的评估[125 I]碘乙烯基类似物的相对靶组织保留和对雌激素受体的结合亲和力。通过在H 2 O 2或氯胺-T存在下,将相应的三丁基锡烷基前体脱甲锡,并保持构型,来制备异构的碘乙烯基和[125I]碘乙烯基衍生物。20Z异构体6的受体结合亲和力比20E异构体3略高,所有八个异构体产物的相对结合亲和力值都在20-50范围内。与未取代的母体分子相比,11个β和7个α-取代的(碘乙烯基)雌二醇给出了更高的雌激素受体介导的子宫摄取。从[125I] -3和-6的体内分布模式,可以明显看出11个β-或7个α-取代基的作用与碘乙烯基的构型之间的协同作用。注射后2 h,11β-甲氧基衍生物3b的20E异构体观察到最佳子宫吸收。但是,在注射后5 h,20Z异构体6b的子宫浓度高