姜黄(姜和姜黄家族)的治疗特性在传统医学中早已为人所知。然而,直到最近才有从姜黄中提取的愈创木脂类倍半萜已提交生物测试,并强调其增强的生物活性。在这些化合物中,phaeocaulisin A 显示出显着的抗炎和抗癌活性,这似乎与嵌入其四环框架中的独特桥接缩醛部分有关。由于 phaeocaulisin A 的有希望的生物学特征以及缺乏合成路线的提示,我们已经在 17 个步骤中实现了 phaeocaulisin A 的第一个对映选择性全合成,总产率为 2%。我们的路线设计建立在鉴定富含对映体的内酯中间体的基础上,该中间体采用酮部分和共轭烯烃系统进行定制。利用原型单电子转移 (SET) 还原剂二碘化钐 (SmI) 实现的 umpolung 羰基-烯烃偶联反应性2), the lactone intermediate was submitted to two sequential SmI2-mediated
Total Synthesis of the Anti-Apoptotic Agents Iso- and Bongkrekic Acids
作者:Antoine Francais、Antonio Leyva、Gorka Etxebarria-Jardi、Steven V. Ley
DOI:10.1021/ol902676t
日期:2010.1.15
The first convergent total synthesis of isobongkrekic acid is reported involving three different stereospecific palladium cross-couplings for the formation of the diene units. Access to bongkrekic acid by this route is also demonstrated. These syntheses involve the formation of several potentially general building blocks.
(MCRs) is highly sought-after in chemical synthesis. However, catalytic asymmetric MCRs, particularly involving radical species, remain largely underdeveloped due to the exceptionally high reactivity of open-shell radical species. Herein, we report a metallaphotoredox-catalyzed asymmetric three-component method to access a diverse array of enantio-enriched α-alkenyl phosphonates from readily available
作者:Áron Péter、Giacomo E. M. Crisenza、David J. Procter
DOI:10.1021/jacs.2c02188
日期:2022.4.27
tetracyclic framework. Prompted by the promising biological profile of phaeocaulisin A and by the absence of a synthetic route for its provision, we have implemented the first enantioselective totalsynthesis of phaeocaulisin A in 17 steps with 2% overall yield. Our route design builds on the identification of an enantioenriched lactone intermediate, tailored with both a ketone moiety and a conjugated
姜黄(姜和姜黄家族)的治疗特性在传统医学中早已为人所知。然而,直到最近才有从姜黄中提取的愈创木脂类倍半萜已提交生物测试,并强调其增强的生物活性。在这些化合物中,phaeocaulisin A 显示出显着的抗炎和抗癌活性,这似乎与嵌入其四环框架中的独特桥接缩醛部分有关。由于 phaeocaulisin A 的有希望的生物学特征以及缺乏合成路线的提示,我们已经在 17 个步骤中实现了 phaeocaulisin A 的第一个对映选择性全合成,总产率为 2%。我们的路线设计建立在鉴定富含对映体的内酯中间体的基础上,该中间体采用酮部分和共轭烯烃系统进行定制。利用原型单电子转移 (SET) 还原剂二碘化钐 (SmI) 实现的 umpolung 羰基-烯烃偶联反应性2), the lactone intermediate was submitted to two sequential SmI2-mediated