Strategy for a Seven-Membered Ring Closure with Bicyclic Framework
作者:Jean-Marc Duffault
DOI:10.1055/s-1998-1564
日期:1998.1
Radical-induced cyclisations to form 7-membered rings with bicyclic framework were achieved by tributyltin hydride (TBTH) and α,α′-azobis(isobutyronitrile) (AIBN).
A New Route to the Synthesis of Bicyclo [3.3.2] Nonene by Radical Cyclisation
作者:Jean-Marc Duffault、Frédérique Tellier
DOI:10.1080/00397919808004298
日期:1998.7
Abstract Radical-induced cyclisation to form 7-membered ring with bicyclic framework was achieved by tributyltin hydride (TBTH) and α, α'-azobis-(isobutyronitrile) (AIBN).
Intramolecular arylation of properly designed substrates bearing a ketone, formyl, or nitro terminating group was achieved by use of a PdCl2(Ph3P)2–Cs2CO3 reaction system to form a variety of carbocyclic compounds. Arylation in ketone compounds afforded benzene-annulated bridged or spirocycloalkanone derivatives, depending on the structure of the cyclization precursors. Arylation in formyl compounds
通过使用PdCl 2(Ph 3 P)2 -Cs 2 CO 3,对设计适当的带有酮,甲酰基或硝基终止基团的底物进行分子内芳构化反应体系形成各种碳环化合物。取决于环化前体的结构,酮化合物中的芳基化可提供苯环化的桥环或螺环烷酮衍生物。取决于环化前体的结构和反应溶剂,甲酰基化合物中的芳基化发生在α位置(α-芳基化)或羰基碳(羰基芳基化)。α-芳基化的仲硝基以Nef反应的方式部分转化为酮,而叔硝基被部分消除,得到苯乙烯型烯烃。
Palladium-Catalyzed Intramolecular α-Arylation of Aliphatic Ketones
Palladium-Catalyzed Enantioselective Arylation of Racemic Ketones to Form Bridged Bicycles via Dynamic Kinetic Resolution
作者:Xiaolei Huang、William Ray Jun Jie Oh、Jianrong Steve Zhou
DOI:10.1002/anie.201804318
日期:2018.6.25
Enantioselective α‐arylation of racemicketones containing existing α′‐stereocenters is reported for the first time via base‐induced dynamic kinetic resolution. Bridged bicyclic rings are formed in good ee values, which are difficult to obtain otherwise. Furthermore, reactions in DMSO‐d6 resulted in extensive deuteration of both α‐ and α′‐positions in the products, thus supporting a pathway involving
首次通过碱诱导的动力学动力学解析报道了含有现有α'-立体中心的外消旋酮的对映选择性α-芳基化。桥接的双环以良好的ee 值形成,否则很难获得。此外,DMSO- d 6中的反应导致产物中α-和α'-位的大量氘化,从而支持了在催化条件下涉及酮快速,可逆的去质子化的途径。