Convenient indole synthesis from ethynylanilines with a polymer-supported fluoride
摘要:
The cyclization reaction of ethynylanilines having phenyl, alkyl, methoxy, cyano. chloro, mid ethoxycarbonyl groups with (polystyrylmethyl)trimethylammonium fluoride in dry MeCN under an argon atmosphere at 100degreesC proceeded in good yields to give the corresponding indoles without affecting these functional groups. Moreover, the polymer-Supported fluoride could be reused for the cyclization reaction when the deprotection reaction of the N-substituted indole with the fluoride ion 011 resin did not occur under the cyclization conditions. (C) 2002 Elsevier Science Ltd. All rights reserved.
Catalytic asymmetric hydrogenation of indoles using a rhodium complex with a chiral bisphosphine ligand PhTRAP
作者:Ryoichi Kuwano、Manabu Kashiwabara、Koji Sato、Takashi Ito、Kohei Kaneda、Yoshihiko Ito
DOI:10.1016/j.tetasy.2006.01.016
日期:2006.2
Highly enantioselective hydrogenation of N-protected indoles was successfully developed by use of the rhodium catalyst generated in situ from [Rh(nbd)2]SbF6 and the chiralbisphosphine PhTRAP, which can form a trans-chelate complex with a transition metal atom. The PhTRAP–rhodium catalyst required a base (e.g., Cs2CO3) for the achievement of high enantioselectivity. Various 2-substituted N-acetylindoles
通过使用由[Rh(nbd)2 ] SbF 6原位生成的铑催化剂和手性双膦PhTRAP,可以成功地开发出N-保护的吲哚的高度对映选择性氢化反应,可以与过渡金属原子形成反式-螯合物。PhTRAP-铑催化剂需要碱(例如Cs 2 CO 3)才能实现高对映选择性。将各种2-取代的N-乙酰吲哚转化为具有高达95%ee的相应的手性二氢吲哚。3-取代的N - tosylindoles的氢化产生二氢吲哚,其在3-位具有立体异构中心,具有高的对映异构体过量(至多98%ee)。
Practical synthesis of indoles and benzofurans in water using a heterogeneous bimetallic catalyst
paper describes the preparation of indoles, azaindoles and benzofurans in pure water by using a new heterogeneous Pd-Cu/C catalyst through a cascade Sonogashira alkynylation-cyclization sequence. Details of the optimization studies and the substrate scope are discussed. This procedure allows the preparation of heterocycles with good yields and is tolerant to a wide variety of functional groups.
Convenient Indole Synthesis from 2-Iodoanilines and Terminal Alkynes by the Sequential Sonogashira Reaction and the Cyclization Reaction Promoted by Tetrabutylammonium Fluoride (TBAF)
The sequential Sonogashira reaction and the cyclization reaction of various 2-iodoanilines and terminal alkynes in the presence of a palladium catalyst and tetrabutylammonium fluoride (TBAF) gave the corresponding 2-substituted indoles in good yields.
Ruthenium-Catalyzed Asymmetric Hydrogenation of <i>N</i>-Boc-Indoles
作者:Ryoichi Kuwano、Manabu Kashiwabara
DOI:10.1021/ol061039x
日期:2006.6.1
enantioselective hydrogenation of various N-Boc-indoles proceeded successfully in the presence of the ruthenium complex generated from an appropriate ruthenium precursor and a trans-chelate chiral bisphosphine PhTRAP. Various 2- or 3-substituted indoles were converted into chiral indolines with high enantiomeric excesses (up to 95% ee). The PhTRAP-ruthenium catalyst was able to promote the hydrogenation of 2,3-dimethylindoles
Platinum-Catalyzed, One-Pot Tandem Synthesis of Indoles and Isoquinolines via Sequential Rearrangement of Amides and Aminocyclization
作者:Noriko Okamoto、Kei Takeda、Reiko Yanada
DOI:10.1021/jo101347f
日期:2010.11.19
By using platinum(II) chloride as a Lewis acid catalyst, concise and efficient syntheses of indole carbamates, 1,2-dihydroisoquinoline carbamates, macrocyclic indole carbamates, indole ureas, and indole phosphoranes have been achieved via tandem Hofmann-type rearrangement of 2-alkynylbenzamides and 2-alkynylbenzylamides, nucleophilic addition of alcohols and amines to the isocyanate intermediates,