Organocopper-Triggered Cyclisation of Conjugated Diene-ynes: Diastereo- and Enantioselective Synthesis of Indenes
作者:Tanzeel Arif、Cyril Borie、Aura Tintaru、Jean-Valère Naubron、Nicolas Vanthuyne、Michèle P. Bertrand、Malek Nechab
DOI:10.1002/adsc.201500556
日期:2015.11.16
high diastereofacial discrimination in the cyclisation step allowed the construction of the quaternary stereocentre with excellent dr and ee, with the opposite configuration depending on the E- or Z-configuration of the alkene in the starting material. Post-functionalisation of indenes allowed the synthesis of indanyl derivatives containing four contiguous stereocentres.
有机铜试剂与容易获得的手性共轭二烯-炔反应,得到带有两个立体异构中心的茚衍生物。在光学纯系列中对该原始反应的研究表明,手性的双重转移正在起作用。涉及S N 2'的立体控制级联反应,然后进行碳cup合和共轭加成反应,可解决初始手性的全部恢复问题。研究了反应的范围和局限性。环化步骤中的高非对立面辨别力允许构建具有出色的dr和ee的四元立体中心,其相反的配置取决于E-或Z-起始原料中烯烃的构型。茚的后功能化允许合成包含四个连续的立体中心的茚满基衍生物。
Synthesis of 9-Fluorenylidenes and 9,10-Phenanthrenes through Palladium-Catalyzed Aryne Annulation by <i>o</i>-Halostyrenes and <i>o</i>-Halo Allylic Benzenes
作者:Shilpa A. Worlikar、Richard C. Larock
DOI:10.1021/jo9017827
日期:2009.12.4
A number of functionally substituted 9-fluorenylidenes and 9,10-phenanthrenes have been synthesized from substituted o-halostyrenes and o-halo allylic benzenes respectively in good yields by the palladium-catalyzed annulation of arynes. The methodology tolerates a variety of functional groups, including cyano, ester, aldehyde, and ketone groups, occurs Under relatively mild reaction conditions, and involves the generation of two new carbon-carbon bonds, thus providing these important carbocyclic ring systems in a single synthetic step.