Oliver Kraft, G. Mittag, Sophie Hoenke, Niels V. Heise, A. Al‐Harrasi, R. Csuk
{"title":"Synthesis and characterization of steroidal, anellated aminothiophenes by Gewald reaction","authors":"Oliver Kraft, G. Mittag, Sophie Hoenke, Niels V. Heise, A. Al‐Harrasi, R. Csuk","doi":"10.13171/mjc02209261446csuk","DOIUrl":null,"url":null,"abstract":"Gewald 3-component reactions (G-3CR), i.e., reactions of a carbonyl compound with an activated nitrile in the presence of a secondary amine and sulfur, lead straightforwardly to anellated 2-aminothiophenes. Interestingly, their application to steroidal hydrocarbons has been limited to a single example. We could show in this work that Gewald 3-component reactions can be performed successfully for molecules holding a cholesterol or sitostanol skeleton, such as 5a-cholestan3-one (8) and 5a-sitostan-3-one (11), thus leading in good yields to the corresponding anellated steroidal 2-amino-thiophenes 12-15. Gewald reaction proved to be an excellent method to access heterocyclic steroids.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"25 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mediterranean Journal of Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.13171/mjc02209261446csuk","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Gewald 3-component reactions (G-3CR), i.e., reactions of a carbonyl compound with an activated nitrile in the presence of a secondary amine and sulfur, lead straightforwardly to anellated 2-aminothiophenes. Interestingly, their application to steroidal hydrocarbons has been limited to a single example. We could show in this work that Gewald 3-component reactions can be performed successfully for molecules holding a cholesterol or sitostanol skeleton, such as 5a-cholestan3-one (8) and 5a-sitostan-3-one (11), thus leading in good yields to the corresponding anellated steroidal 2-amino-thiophenes 12-15. Gewald reaction proved to be an excellent method to access heterocyclic steroids.