Synthesis of Functionalized 4a-Methyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrenes
摘要:
Thr title compounds were constructed by a Neck reaction of functionalized aryl halides with homoallylic alcohols followed by Michael addition and subsequent cyclocondensation.
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 9,10-Phenanthrenes via Palladium-Catalyzed Aryne Annulation by <i>o</i>-Halostyrenes and Formal Synthesis of (±)-Tylophorine
作者:Tuanli Yao、Haiming Zhang、Yanna Zhao
DOI:10.1021/acs.orglett.6b00558
日期:2016.6.3
A novel palladium-catalyzedannulation reaction of in situ generated arynes and o-halostyrenes has been developed. This methodology affords moderate to excellent yields of substituted phenanthrenes and is tolerant of a variety of functional groups such as nitrile, ester, amide, and ketone. This annulation chemistry has been successfully applied to the formal total synthesis of a biologically active
The application of a C(vinyl), C(aryl)-palladacycle from vinyl-containing substrates is challenging due to the interference of a reactive double bond in palladium catalysis. This Letter describes a [4 + 2] or [4 + 3] cyclization based on a C(vinyl), C(aryl)-palladacycle by employing α-oxocarboxylic acids as the insertion units under a palladium/air system. The reaction proceeded through the key vinyl
Palladium-Catalyzed Sequential C–H Activation/Amination with Diaziridinone: An Approach to Indoles
作者:Jing Li、Jinhua Chen、Luying Wang、Yian Shi
DOI:10.1021/acs.orglett.1c01043
日期:2021.5.7
an important class of molecules. This paper describes an efficient palladium-catalyzed synthesis of indoles from 2-iodostyrenes and di-t-butyldiaziridinone with a simultaneous installation of two C–N bonds. The reaction process likely proceeds through the oxidative insertion of Pd to aryl iodide and subsequent vinyl C–Hactivation to from a pallada(II)cycle intermediate, which is bisaminated by di
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。