[EN] PROCESS FOR THE PREPARATION OF 1-PHENYL-3-DIMETHYLAMINOPROPANE DERIVATIVES [FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE 1-PHÉNYL-3-DIMÉTHYLAMINOPROPANE
development of enantioconvergent cross‐coupling of racemic alkyl halides directly with heteroarene C(sp2)−H bonds has been impeded by the use of a base at elevated temperature that leads to racemization. We herein report a copper(I)/cinchona‐alkaloid‐derived N,N,P‐ligand catalytic system that enables oxidative addition with racemic alkyl bromides under mild conditions. Thus, coupling with azole C(sp2)−H bonds
A general asymmetric copper-catalysed Sonogashira C(sp3)–C(sp) coupling
作者:Xiao-Yang Dong、Yu-Feng Zhang、Can-Liang Ma、Qiang-Shuai Gu、Fu-Li Wang、Zhong-Liang Li、Sheng-Peng Jiang、Xin-Yuan Liu
DOI:10.1038/s41557-019-0346-2
日期:2019.12
versatile reaction for the straightforward formation of C–C bonds, forging the carbon skeletons of broadly useful functionalized molecules. However, asymmetric Sonogashira coupling, particularly for C(sp3)–C(sp) bond formation, has remained largely unexplored. Here we demonstrate a general stereoconvergent Sonogashira C(sp3)–C(sp) cross-coupling of a broad range of terminal alkynes and racemic alkyl halides
Novel Intermediate Used for Preparing Tapentadol or Analogues Thereof
申请人:Anhui New Star Pharmaceutical Development Co., Ltd
公开号:US20160052873A1
公开(公告)日:2016-02-25
The invention discloses a novel intermediate for preparing tapentadol and analogues thereof, wherein the structural formula is shown as formula I or II, and the groups are defined as the specification. The invention further discloses a method for preparing the novel intermediate and use of the intermediate for preparing tapentadol and analogues thereof. The invention can remarkably improve the product yield and quality of tapentadol, reduce the production cost, and simplify the production procedure. The preparation process is environment friendly, thus more suitable for the requirements of industrial production.
Design of Hemilabile N,N,N-Ligands in Copper-Catalyzed Enantioconvergent Radical Cross-Coupling of Benzyl/Propargyl Halides with Alkenylboronate Esters
halides with alkenylboronate esters is an appealing tool in the assembly of synthetically valuable enantioenriched alkenes owing to the ready availability, low toxicity, and air/moisture stability of alkenylboronate esters. Here, we report a copper/chiral N,N,N-ligand catalytic system for the enantioconvergent cross-coupling of benzyl/propargyl halides with alkenylboronate esters (>80 examples) with good