在这项工作中,设计、合成和测试了新的甾体芳香酶抑制剂 (AI)。在一种方法中,研究了 C 环取代的类固醇,即在 C-11 位置用 α 或 β 羟基或羰基官能化的类固醇以及 C-9/C-11 甾体烯烃和环氧化物。发现 C-11 的羰基比羟基更利于抑制芳香酶,并且 C 环环氧化物比 C 环烯烃更有效,从而发现了一种非常强的 AI,化合物7,IC 50为 0.011 μM,优于临床使用的类固醇 AI 依西美坦,其 IC 500.050 μM。在另一种方法中,我们探索了 A 环 C-1/C-2 甾体烯烃和环氧化物与芳香酶抑制相关的生物活性,并将其与 C 环 C-9/C-11 甾体烯烃的生物活性进行了比较,环氧化物。与观察到的 C 环烯烃和环氧化物相反,A 环环氧化物的效力低于 A 环烯烃。最后,将7β-甲基取代对芳香酶的抑制作用与7α-甲基取代进行了比较,表明7β-甲基取代7α-甲基优于7α-甲基取代。分子模型研究表明,与
Significant steroids: effective and general synthesis of 4α- and 4β-amino-5α-androstanes
作者:Xianbing Ke、Hao Hu、Keda Zhang、Wenjin Xu、Qifeng Zhu、Lamei Wu、Xianming Hu
DOI:10.1039/b817910g
日期:——
4α-Aminosteroids were synthesized by the substitution of a 2α-bromo ketone using K2CO3 as an activator; 4β-aminosteroids were synthesized in excellent yields by a highly regioselective and trans-stereospecific ring opening of a steroidal 3,4α-epoxide using ZnCl2âH2O as a catalyst.
The use of tetramethylguanidinium azide in non-halogenated solvents avoids potential explosion hazards
作者:C. Li、Tzenge-Lien Shih、Jae Uk Jeong、Ashok Arasappan、P.L. Fuchs
DOI:10.1016/s0040-4039(00)76995-4
日期:1994.4
Tetramethylguanidinium azide was used in the quantitative conversion of glycosyl halides 1 – 5 to the corresponding glycosyl azides 10 – 14. The stereoselective reactions occurred with complete inversion at the anomeric centers. The titled reagent was also employed in the selective synthesis of pseudoglycosyl azide 16 and two steroidal azides 17 and 18. All reactions were carried out in non-halogenated
The Cephalostatins. 22. Synthesis of Bis-steroidal Pyrazine Pyrones
作者:George R. Pettit、Bryan R. Moser、Ricardo F. Mendonça、John C. Knight、Fiona Hogan
DOI:10.1021/np300069z
日期:2012.6.22
Cephalostatin 1 (1), a remarkably strong cancer cell growth inhibitory trisdecacyclic, bis-steroidal pyrazine isolated from the marine tube worm Cephalodiscus gilchristi, continues to be an important target for practicaltotal syntheses and a model for the discovery of less complex structural modifications with promising antineoplastic activity. In the present study, the cephalostatin E and F rings
Controlled alkaline hydrolysis of steroidal α-bromoketones: New conditions and synthesis of 2α-hydroxy-3-ones
作者:Mitsuteru Numazawa、Masao Nagaoka
DOI:10.1016/0039-128x(82)90152-0
日期:1982.3
Controlledalkalinehydrolysis of 16 alpha-bromo-17-keto steroids 1, 5 and 7 with potassium carbonate and tetra-n-butylammonium hydroxide (n-Bu4NOH) and synthesis of 2 alpha-hydroxy-3-ones 11, 13 and 16 by the controlledhydrolysis of the corresponding 2 alpha-bromo-3-ones 9, 12 and 15 are described. Treatment of the bromoketones 1,5 and 7 with potassium carbonate in aqueous acetone or with n-Bu4NOH