A novel chloropalladation-initiated intermolecular oxyvinylcyclization of alkenes with alkynoic acids or alkynols is developed. This protocol provides a series of 3-methylene γ-lactone and tetrahydrofuran derivatives in moderate to excellent yields with high stereoselectivities in the presence of PdCl2 and CuCl2 or CuCl2·2H2O. Besides a broad substrate scope, this method has the advantages of mild
Regioselective Synthesis of Isocoumarins via Iridium(III)-Catalyzed Oxidative Cyclization of Aromatic Acids with Propargyl Alcohols
作者:Pinki Sihag、Masilamani Jeganmohan
DOI:10.1021/acs.joc.8b03077
日期:2019.3.1
An Ir(III)-catalyzed oxidative cyclization of benzoic acids with propargyl alcohols to give substituted isocoumarins in a highly regioselective manner is described. This protocol has a broad substrate scope with high functional group tolerance. The observed isocoumarins were converted into biologically active tetracyclic indeno[2,1-c]isocoumarins by Lewis acid-mediated cyclization. A possible reaction
描述了用炔丙基醇进行的Ir(III)催化的苯甲酸氧化环化反应,以高度区域选择性的方式生成取代的异香豆素。该协议具有广泛的底物范围,具有较高的官能团耐受性。通过路易斯酸介导的环化作用将观察到的异香豆素转化为具有生物活性的四环茚并[ 2,1- c ]异香豆素。提出了一种可能的反应机理,并由详细的机理研究和DFT大力支持。
Synthesis of Polysubstituted 2-Iodoindenes via Iodonium-Induced Cyclization of Arylallenes
作者:Charlotte Grandclaudon、Véronique Michelet、Patrick Y. Toullec
DOI:10.1021/acs.orglett.5b03634
日期:2016.2.19
2-iodoindenes. In acetonitrile or nitromethane, electrophilic sources of iodine cations react selectively with the C2–C3 double bond of 1-arylallenes to give, after anti nucleophilic attack of the aromatic ring, 2-iodoindene products in high yields. Variations of the allenic skeletons revealed the high 5-endo selectivity and some competitive pathways of cyclization. Postfunctionalization reactions of the carbon–iodine
Palladium(II)/N-Heterocyclic Carbene-Catalyzed Regioselective Heteroannulation of Tertiary Propargyl Alcohols and<i>o</i>-Haloanilines to form 2-Alkenylindoles
Monometallic and bimetallic palladium(II)/N‐heterocyclic carbene complexes appended with naphthalimide or bisnaphthalimide moieties were designed, synthesized, and characterized. Employment of these catalysts brings about the step‐economic and regioselective heteroannulation of tertiary propargyl alcohols with o‐haloanilines resulting in biologically and pharmaceutically relevant 2‐alkenylindoles. Basis
Synthesis of Isoquinolines through Ir<sup>III</sup>
-Catalyzed C-H Activation/Annulation from Benzimidates with Hydroxylisopropylalkynes
作者:Mingliang Liu、Wanchun Gong、Erli You、Haizhen Zhang、Lei Shi、Weiguo Cao、Jingjing Shi
DOI:10.1002/ejoc.201800410
日期:2018.9.30
An IrIII‐catalyzed cascade reaction consisting of C–H activation and annulation of benzimidates with hydroxylisopropylalkynes yields a broad range of isoquinolines in one step with good functional‐group tolerance and high efficiency.