57072-90-9Relevant articles and documents
Iridium-Catalyzed Three-component Coupling Reaction of Carbon Dioxide, Amines, and Sulfoxonium Ylides
Jiang, Huanfeng,Zhang, Hao,Xiong, Wenfang,Qi, Chaorong,Wu, Wanqing,Wang, Lu,Cheng, Ruixiang
supporting information, p. 1125 - 1129 (2019/05/16)
The first iridium-catalyzed three-component coupling reaction of carbon dioxide, amines, and sulfoxonium ylides has been developed, providing an efficient and straightforward method for the construction of a range of structurally diverse O-β-oxoalkyl carbamates in moderate to excellent yields. This novel protocol features the use of readily available substrates, wide substrate scope, and good functional group tolerance. Moreover, the phosgene-free strategy was successfully applied to the synthesis of a potential antitumor agent.
Substrate interaction with 5alpha-reductase enzyme: influence of the 17beta-chain chirality in the mechanism of action of 4-azasteroid inhibitors.
Grisenti,Magni,Olgiati,Manzocchi,Ferraboschi,Villani,Pucciariello,Celotti
, p. 803 - 810 (2007/10/03)
A series of steroidal compounds were synthesized in order to evaluate the possible influence of the configuration of a stereocenter in the 17beta-side chain on the inhibitory activity on the enzyme 5alpha-reductase (5AR). For this purpose diastereomerically pure 4-azasteroids epimers at C-22 were prepared (compounds 1-11) and tested as inhibitors of 5AR in "in vitro" tests. The obtained data showed that in most cases the couples of epimers possess a significant difference in their biological activity. We also considered, for the tested molecules, a series of chemico-physical parameters in order to find a possible correlation with their biological activity. The findings allowed us to propose a model of the binding site of 5AR which comprises also, for 4-azasteroid inhibitors, the configurational aspect of the 17beta-side chain.
Synthesis of N-substituted 3-oxo-17β -carboxamide-4-aza-5α-androstanes and the tautomerism of 3-oxo-4-aza-5-androstenes
Xia, Peng,Yang, Zheng-Yu,Xia, Yi,Zhang, Hao-Bing,Zhang, Ke-Hua,Sun, Xun,Chen, Ying,Zheng, Yun-Qing
, p. 703 - 716 (2007/10/03)
An N-aryl-3-oxo-4-aza-5α -androst-1-ene-17β carboxamide and three N-aryl or alkyl substituted 17α -hydroxy-3-oxo-4-aza-5α -androstane-17β -carboxamides were synthesized as antiandrogen candidates from 3-oxoandrost-4-ene-17β - carboxylic acid and androst-4-ene-3,17-dione respectively. The chemo- and stereoselective reduction of 3-oxo-4-aza-5-ene intermediates with formic acid and their tautomerism in a solution of chloroform and methanol were described.