Copper complexes of phosphoramidites efficiently catalyzed asymmetricaddition of arylboron reagents to acyclic enones. Importantly, rare 1,4-insertion of arylcopper(I) was identified which led directly to O-bound copper enolates. The new mechanism is fundamentally different from classical oxidative addition/reductive elimination of organocopper(I) on enones.
亚磷酰胺的铜配合物有效地催化芳基硼试剂向无环烯酮的不对称加成。重要的是,鉴定了稀有的芳基铜(I)的 1,4-插入,这直接导致了与 O 结合的铜烯醇化物。新机制与传统的有机铜(I)在烯酮上的氧化加成/还原消除有着根本的不同。
Preparation of Quaternary Centers via Nickel-Catalyzed Suzuki–Miyaura Cross-Coupling of Tertiary Sulfones
作者:Zachary T. Ariki、Yuuki Maekawa、Masakazu Nambo、Cathleen M. Crudden
DOI:10.1021/jacs.7b10855
日期:2018.1.10
benzylic and allylic sulfones with arylboroxines. A variety of tertiary sulfones, which can easily be prepared via a deprotonation-alkylation route, were reacted to afford symmetric and unsymmetric quaternary products in good yields. We highlight the use of either BrettPhos or Doyle's phosphines as effective ligands for these challenging desulfonative coupling reactions. The utility of this methodology
我们描述了叔苄基和烯丙基砜与芳基环硼烷的镍催化 Suzuki-Miyaura 交叉偶联的开发。可以通过去质子化-烷基化路线轻松制备的各种叔砜反应以良好的收率提供对称和不对称季产物。我们强调使用 BrettPhos 或 Doyle 膦作为这些具有挑战性的脱磺化偶联反应的有效配体。这种方法的实用性在维生素 D 受体调节剂类似物的简明合成中得到了证明。
Rhodium(I)-Catalyzed Arylation/Dehydroxylation of <i>tert</i>
-Propargylic Alcohols Leading to Tetrasubstituted Allenes
alcohols and arylboroxines under rhodium catalysis. The reaction is assumed to proceed through an arylation/dehydroxylation process, which involves β‐hydroxide elimination of a β‐hydroxy alkenyl‐rhodium intermediate that is generated by regioselective arylrhodation of the tert‐propargylic alcohol. In addition, when enantioenriched propargylic alcohol was used to prepare optically active allene, high
Alkynes react with organoborons under a CO atmosphere in the presence of a rhodium(I) catalyst to afford mainly 5-aryl-2(5H)-furanones, α,β-unsaturated ketones, and indanones. The product selectivity can be tuned by modifying the reaction conditions.
[EN] SYNTHESIS AND USE OF FLUORINATED COMPOUNDS<br/>[FR] SYNTHÈSE ET UTILISATION DE COMPOSÉS FLUORÉS
申请人:UNIV PENNSYLVANIA
公开号:WO2014126990A1
公开(公告)日:2014-08-21
The invention is directed to the preparation of fluorinated compounds and their use in organic synthesis. In particular, the invention is directed to methods of reacting compounds of structure with Rf-CH=N2 or (CF3)2C=N2 to form a perfluoroalkylate or -arylated compounds, and products derived from these reactions, where X, YB, and Rf are described herein.