کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2028018 | 1070388 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A systematic approach to the synthesis of androstane-based 3,17-dicarboxamides (homo- and mixed dicarboxamides) via palladium-catalyzed aminocarbonylation A systematic approach to the synthesis of androstane-based 3,17-dicarboxamides (homo- and mixed dicarboxamides) via palladium-catalyzed aminocarbonylation](/preview/png/2028018.png)
• Novel androstane-based 3,17-dicarboxamides were synthesized.
• Systematic investigation on the synthesis of homo- and mixed diamides was carried out.
• The products are potential 5α-reductase inhibitors of pharmacological importance.
• High-yielding aminocarbonylation was used as key-reaction in the multistep synthesis.
3,17-Dicarboxamido-androst-3,5,16-triene derivatives possessing various amine moieties were synthesized under mild conditions using palladium-catalyzed homogeneous aminocarbonylation as key reaction. Compounds containing the corresponding iodoalkene functionalities, i.e., 17-iodo-16-ene and 3-iodo-3,5-diene structural motifs, were used in the aminocarbonylation and the N-nucleophiles were varied systematically. Three amines, such as tert-butylamine, piperidine and methyl alaninate were used as N-nucleophiles in the aminocarbonylation. All variations of 3,17-dicarboxamides were synthesized using this methodology.Androst-4-ene-3,17-dione was used as starting material. The synthetic strategy of the multistep synthesis was based on the systematic variation and consecutive use of three different reactions: (i) the protection/deprotection of one of the keto functionalities (3-one or 17-one) as ethylene ketals, (ii) the transformation of the other keto group to iodoalkene functionality via its hydrazone, and (iii) palladium-catalyzed aminocarbonylation of the iodoalkene functionality.
3,17-Dicarboxamido-androst-3,5,16-triene derivatives possessing various amine moieties, such as tert-butylamine, pyperidine and methyl alaninate, were synthesized using palladium-catalyzed homogeneous carbonylation as key-reaction. All variations of the homo- and mixed diamides were synthesized from androst-4-ene-3,17-dione via protection of the appropriate keto functionalities, transformation of the keto groups to iodo-alkenes and aminocarbonylation of the corresponding 17-iodo-16-ene and 3-iodo-3,5-diene moieties.Figure optionsDownload as PowerPoint slide
Journal: Steroids - Volume 78, Issue 7, July 2013, Pages 693–699