Iridium-Catalyzed, Weakly Coordination-Assisted Ortho-Alkynylation of (Hetero)aromatic Carboxylic Acids without Cyclization
摘要:
It is reported a weakly coordination-assisted alkynylation of aryl and heteroaryl carboxylic acids with iridium catalysis. The reaction is catalyzed by [{Cp*IrCl2}(2)] complex without cyclization, forming ortho-alkynylated aryl and heteroaryl carboxylic acids, and features high functional group tolerance and broad substrate scope under an air atmosphere. 2-(Hetero)aryl-substituted acetic acids were amenable to the alkynylation by forming an unusual six-membered ring cycloiridiated intermediate.
annulation of readily available benzoicacids and alkynes is reported for the first time. The carboxylate group acts as both a directing group and an internal nucleophilic reagent to facilitate a C(sp2)–H vinylation/annulation cascade. This reaction avoids the classically oxidative [4+2] annulation, allowing the efficient synthesis of a wide array of eight-membered lactones under oxidant-free conditions
[EN] INDUSTRIAL METHODS FOR PRODUCING ARYLSULFUR PENTAFLUORIDES<br/>[FR] PROCÉDÉS INDUSTRIELS POUR PRODUIRE DES PENTAFLUORURES D'ARYLSOUFRE
申请人:UBE INDUSTRIES
公开号:WO2012111839A1
公开(公告)日:2012-08-23
Industrial methods for producing arylsulfur pentafluorides are disclosed. Methods include reacting arylsulfur halotetrafluoride with hydrogen fluoride in the absence or presence of one or more additives selected from a group of fluoride salts, non-fluoride salts, and unsaturated organic compounds to form arylsulfur pentafluorides.
Regioselective C−H Alkylation via Carboxylate‐Directed Hydroarylation in Water
作者:Guodong Zhang、Fan Jia、Lukas J. Gooßen
DOI:10.1002/chem.201800757
日期:2018.3.26
afford the corresponding 2‐alkylbenzoic acids in moderate to excellent yields. This C−H alkylation process is generally applicable to diversely substituted electron‐rich and electron‐deficient benzoic acids, along with α,β‐unsaturated olefins including unprotected acrylic acid. The widely available carboxylate directing group can be removed or utilized for further derivatization. Mechanistic investigations
在催化性[RuCl 2(p- cym)] 2的存在下,以Li 3 PO 4为碱,苯甲酸与水中的烯烃反应,以中等至极好的收率得到相应的2-烷基苯甲酸。这种CH烷基化过程通常适用于各种取代的富电子和缺电子的苯甲酸,以及包括未保护丙烯酸的α,β-不饱和烯烃。广泛使用的羧酸酯导向基团可以被除去或用于进一步的衍生化。机理研究表明,转化是通过钌循环中间体进行的。
Merging C–H Activation and Strain–Release in Ruthenium-Catalyzed Isoindolinone Synthesis
2-oxazetidines with carboxylic aciddirected C–H activation in catalytic synthesis of isoindolinones is reported for the first time. This reaction opens a new and sustainable avenue to prepare a range of structurally diverse isoindolinone skeletons from readily available benzoicacids. The success of late-stage functionalization of some bioactive acids, and concise synthesis of biologically important skeletons
One-Pot Synthesis of Phenacyl Esters from Acetophenone, [Bmim]Br<sub>3</sub>, and Potassium Salts of Carboxylic Acids Under Solvent-Free Conditions
作者:Zhang-Gao Le、Zong-Bo Xie、Jian-Ping Xu
DOI:10.1080/00397910802431115
日期:2009.1.28
Abstract One-pot synthesis of phenacyl esters from acetophenone, [Bmim]Br3, and potassium salts of carboxylic acids under solvent-free conditions gave the corresponding phenacyl esters with excellent yields.