Palladium-Catalyzed Intramolecular Cyclization of o-Ethynylbenzoic Acids and o-Ethynylbenzamides: Preparation of Isocoumarins and Isoquinolin-1-ones
摘要:
Treatment of the o-ethynylbenzoic acids 1A with a catalytic amount of Pd(II) and triethylamine resulted in the 6-endo-dig cyclization to give the 3-substituted isocoumarins 3 as major products in moderate to good yields. Similarly, the palladium-catalyzed cyclization of o-ethynylbenzamides 1B also proceeded but afforded only the isoquinolin-1-ones 3B.
Synthesis of 1-Aminoisoquinolines by Gold(III)-Mediated Domino Reactions from 2-Alkynylbenzamides and Ammonium Acetate
作者:Yuhua Long、Zhigang She、Xiaochen Liu、Yu Chen
DOI:10.1021/jo302794z
日期:2013.3.15
1-aminoisoquinoline derivatives by gold(III)-mediated domino reactions is described. This synthetic protocol starts from readily available 2-alkynylbenzamides and ammonium acetate and takes place under mild reaction conditions compatible with a variety of functional groups. A plausible mechanism for the dominoprocess is proposed, supported by the reaction of a possible intermediate, N-(3-phenyl-1H-isochrom
A General Synthesis of Alkenyl‐Substituted Benzofurans, Indoles, and Isoquinolones by Cascade Palladium‐Catalyzed Heterocyclization/Oxidative Heck Coupling
作者:Rosana Álvarez、Claudio Martínez、Youssef Madich、J. Gabriel Denis、José M. Aurrecoechea、Ángel R. de Lera
DOI:10.1002/chem.201001535
日期:2010.11.8
consecutive Sonogashira and cascade Pd‐catalyzedheterocyclization/oxidativeHeckcouplings from readily available ortho‐iodosubstituted phenol, aniline, and benzamide substrates, alkynes, and functionalized olefins. The cyclization of O‐ and N‐heteronucleophiles follows regioselective 5‐endo‐dig‐ or 6‐endo‐dig‐cyclization modes, whereas the subsequent Heck‐type coupling with both mono‐ and disubstituted
Palladium-Catalyzed Regioselective 5-<i>exo</i>-<i>O</i>-Cyclization/Oxidative Heck Cascades from<i>o</i>-Alkynylbenzamides and Electron-Deficient Alkenes
作者:Youssef Madich、Rosana Álvarez、José M. Aurrecoechea
DOI:10.1002/ejoc.201402709
日期:2014.10
Pd-catalyzed 5-exo-selective oxycyclization/oxidative Heck coupling cascade is described, starting from readily available ortho-alkynylbenzamides and functionalized olefins. The key to a high regioselectivity in the cyclization step is the choice of catalyst and/or additives. Thus, Pd(OAc)2 provides the desired 5-exo products predominantly, whereas with PdCl2 or Pd(TFA)2, the corresponding 6-endo products
Metal-free, one-pot tandem reactions of o-(1-alkynyl)benzamides proceed smoothly in the presence of Lawesson’s reagent leading to 1,3-dihydrobenzo[c]thiophene-imine derivatives in moderate to excellent yields under mild conditions. The method is highly regiospecific for the o-(1-alkynyl)benzothioamide, and only the five-membered-ring product is generated via a 5-exo-dig cyclization involving the
在Lawesson试剂的存在下,o-(1-炔基)苯甲酰胺的无金属单锅串联反应可顺利进行,从而在温和的条件下以中等至极好的收率得到1,3-二氢苯并[ c ]噻吩-亚胺衍生物。该方法对邻-(1-炔基)苯并硫代酰胺具有高度的区域特异性,并且通过涉及硫原子的5- exo- dig环化仅生成五元环产物。 邻-(1-炔基)苯并硫代酰胺-串联反应-Lawesson试剂-无金属-杂环
Regioselective Synthesis of Substituted Imidate N-[1-Methyleneisobenzofuran-3(1H)-ylidene]benzenamines via Palladium-Catalyzed Tandem Heteroannulation of o-(1-Alkynyl)benzamides with Iodobenzene
A variety of substituted imidate N-[1-methyleneisobenzofuran-3(1H)-ylidene]benzenamines have been prepared in good to excellent yields by the palladium-catalyzed tandem heteroannulation of o-(1-alkynyl)benzamides with iodobenzene. The products obtained from this process were unusual substituted N-[isobenzofuran-3(1H)-ylidene]benzenamines. The tandem cyclization of readily available o-(1-alkynyl)benzamides