合成了含硫醇的雄激素17β-羟基-10β-巯基雌酮-4-烯-3-酮和19巯基雄酮-4-烯-3,17-二酮并在人胎盘微粒体中测试了其抑制自杀的能力芳香酶。两种化合物均显示出芳香酶的时间依赖性伪一级反应失活速率,Ki分别为106和34 nM,kcat分别为3.2 X 10(-3)和1.2 X 10(-3)s-1。在30摄氏度时,扩散透析无法重新激活先前被任一化合物灭活的芳香酶,并且两种化合物都需要存在NADPH和O2才能使该酶随时间而失活。底物,androst-4-ene-3,17-dione(5.0 microM)的存在可以保护酶免于灭活,而半胱氨酸(1.0 mM)不能保护芳香酶不受任何一种化合物的灭活。
Influence of Catalyst on the Formation of 5(10)-Ene Ketals From Estra-4-en-3-ones
作者:Arvind S. Negi、Amita Kaushal、Reema Rastogi、Suprabhat Ray
DOI:10.1080/00397919708003372
日期:1997.7
Abstract The effect of catalyst on formation of isomeric ketals from 19-nortestosterone and 19-nor-ethisterone is reported. Regioselectivity has been achieved with metalhydrides as catalyst, reported for the first time, to give 5(10)-ene ketals. #CDRI communication No. 5396
Tandon, Amita; Ray, Suprabhat, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1992, vol. 31, # 1, p. 58 - 59
作者:Tandon, Amita、Ray, Suprabhat
DOI:——
日期:——
Synthesis of C-6 fluoroandrogens: Evaluation of ligands for tumor receptor imaging
作者:Yearn Seong Choe、John A. Katzenellenbogen
DOI:10.1016/0039-128x(95)00009-f
日期:1995.5
Seven androgens, substituted with fluorine at C-6, were prepared as potential imaging agents for androgen receptor-positive prostate tumors and were evaluated in vitro in terms of their lipophilicity and their relative binding affinities (RBA, relative to R 1881 = 100) for the androgen receptor and for sex steroid binding protein. Introduction of a fluorine atom into the C-6 position of an androgen generally decreases binding affinity to the androgen receptor, except in the two cases: 6 alpha-fluoro-19-nor-testosterone (RBA = 41.6 versus 30.6 for the unsubstituted steroid) and 6 alpha-fluoro-19-nor-testosterone (RBA = 8.9 versus 6.6). Receptor binding of the C-6 fluoro-androgens is also stereospecific, showing higher binding affinities for the alpha-epimers compared to the corresponding beta-epimers (4:1-15:1). Binding affinity to sex steroid binding protein is the lowest with 19-nor-testosterone, which is also the least lipophilic androgen studied. Based on the binding properties of compounds in this series, 6 alpha-fluoro-19-nor-testosterone appears to have the most promise as a turner imaging agent.