Modified Julia–Kocienski Reagents for a Stereoselective Introduction of Trisubstituted Double Bonds: A Formal Total Synthesis of Limazepine E and Barmumycin
作者:Guna Sakaine、Gints Smits
DOI:10.1021/acs.joc.8b00643
日期:2018.5.4
A formal total synthesis of pyrrolo[1,4]benzodiazepine anticancer antibiotic family member limazepine E is described. The synthesis features a stereoselective introduction of a trisubstituted double bond using novel sterically demanding Julia–Kocienski reagents, allowing the number of linear steps to be significantly reduced. The potential of the newly developed reagents has also been demonstrated
Reagents for one-step construction of conjugated bromodienes from aldehydes are described. Various 1-alkyl- and 1-aryl-tetrazoyl bromoallylic sulfones were synthesized and evaluated in bromodiene synthesis. 1-Alkyl-tetrazoyl sulfones selectively afforded (1E,3Z)-bromodienes, while 1-aryl-tetrazoyl sulfones resulted in low selectivity.
Synthesis and anti-viral activity of azolo-adamantanes against influenza A virus
作者:Vladimir V. Zarubaev、Efim L. Golod、Pavel M. Anfimov、Anna A. Shtro、Victor V. Saraev、Alexey S. Gavrilov、Alexander V. Logvinov、Oleg I. Kiselev
DOI:10.1016/j.bmc.2009.11.047
日期:2010.1
Chemotherapy and chemoprophylaxis of influenza is one of the most important directions of health protection activity. Due to the high rate of drug-resistant strains of influenza virus, there is a need for the search and further development of new potent antivirals against influenza with a broad spectrum of activity. In the present study, a set of di-, tri- and tetrazole derivatives of adamantane was efficiently prepared and their anti-influenza activities evaluated against rimantadine-resistant strain A/Puerto Rico/8/34. In general, derivatives of tetrazole possessed the highest virus-inhibiting activity. We demonstrated that several compounds of this set exhibited much higher activity than the currently used antiviral rimantadine, a compound of related structure. Moreover, we showed that these azolo-adamantanes were significantly less toxic. This study demonstrates that influenza viruses can be inhibited by adamantylazoles and thus have potential for developing antiviral agents with an alternate mechanism of action. (C) 2009 Elsevier Ltd. All rights reserved.
Adamantylazoles: XIII. Specificity of acid-catalyzed alkylation of 1-(1-adamantyl)-4,5-dihydro-1H-tetrazole-5-thione
作者:A. V. Logvinov、I. N. Polyakova、E. L. Golod
DOI:10.1134/s1070363209100247
日期:2009.10
In the reaction of 1-(1-adamantyl)-4,5-dihydro-1H-tetrazole-5-thione with 1-adamantyl in sulfuric acid 2-(1-adamantyl)-5-(1-adamantylsulfanyl)-2H-tetrazole and 1,3-bis(1-adamantyl)-5-(1-adamantylsulfanyl)-1H-tetrazolium salt are formed. Methylation of 1-(1-adamantyl)-4,5-dihydro-1H-tetrazole-5-thione in alkaline medium affords 1-(1-adamantyl)-5-methylsulfanyl-1H-tetrazole while its interaction with formaldehyde affoeds 1-(1-adamanttl)-4-(hydroxymethyl)-4,5-dihydro-1H-tetrazole-5-thione.
Hrabalek; Kunes; Pour, Russian Journal of Organic Chemistry, <hi>2000</hi>, vol. 36, # 5, p. 761 - 762