Pd(II)-catalyzed intramolecular aminopalladation/direct C–H arylation under aerobic conditions: synthesis of pyrrolo[1,2-a]indoles
摘要:
Heating a DMA/pivalic acid (v/v=4/1) solution of diversely substituted 6-(phenylamino)hex-2-ynoates in the presence of a catalytic amount of Pd(OAc)(2) under oxygen atmosphere afforded pyrrolo[1,2-a]indoles in moderate to good yields. A domino sequence involving intramolecular aminopalladation followed by C-H activation and reductive elimination was proposed to account for the observed bis-cyclization. (C) 2013 Elsevier Ltd. All rights reserved.
LDA-promoted decomposition of benzenesulfenamides. A route to aminyl radicals by dioxygen oxidation of lithium amides
作者:Anna Barbieri、Pier Carlo Montevecchi、Daniele Nanni、Maria Luisa Navacchia
DOI:10.1016/0040-4020(96)00799-5
日期:1996.10
The LDA-promoted decomposition of N-monosubstituted sulfenamides 1a-d occurs through the formation of thioaminyl anions, which undergo oxidation either at sulfur, with formation of sulfonamides, or at nitrogen, with formation of thioaminyl radicals, depending on the nature of the 4′-substituent. The reaction of N,N-disubstituted sulfenamides 1e-h proceeds through the intermediacy of a lithium complex
important amidyl radicals from N−H amides is an appealing and yet challenging task. Previous methods require a stoichiometric amount of a strong oxidant and/or a costly noble‐metal catalyst. We report herein the first electrocatalytic method that employs ferrocene (Fc), a cheap organometallic reagent, as the redox catalyst to produce amidyl radicals from N‐aryl amides. Based on this radical‐generating
Sulfonamide-Trapping Reactions of Thermally Generated Benzynes
作者:Yuanxian Wang、Lianyou Zheng、Thomas R. Hoye
DOI:10.1021/acs.orglett.8b03085
日期:2018.11.16
Reactions of tethered, tertiary sulfonamides with thermally generated benzynes are reported. Typically, the N–S bonds in the substrates cleave, and saturated heterocycles [tetrahydroquinolines (n = 2) and indolines (n = 1)] are formed. The process is accompanied by either sulfonyl transfer or desulfonylation from a zwitterionic intermediate, with the favored pathway being largely dependent upon the
Stoichiometric and Catalytic Inter- and Intramolecular Hydroamination of Terminal Alkynes by Frustrated Lewis Pairs
作者:Tayseer Mahdi、Douglas W. Stephan
DOI:10.1002/chem.201501535
日期:2015.7.27
FrustratedLewispairs (FLPs) based on sterically encumbered anilines and the Lewis acid B(C6F5)3 were found to react with terminalalkynes effecting intermolecular hydroamination affording iminium alkynylborate species of the form [RPhNC(R′)Me][R′CCB(C6F5)3]. In these cases, the reagent ratio of borane, aniline, and alkyne is 1:1:2. These reactions could also be performed in an intramolecular fashion
发现基于位阻苯胺的沮丧的路易斯对(FLP)和路易斯酸B(C 6 F 5)3与末端炔烃反应,进行分子间加氢胺化反应,从而提供[RPhNC(R')Me]形式的炔基硼酸亚胺盐。 [R'CCB(C 6 F 5)3 ]。在这些情况下,硼烷,苯胺和炔烃的试剂比为1:1:2。这些反应也可以以分子内方式通过使用具有炔基取代基的苯胺来实现环化反应来进行。在H 2气氛下使用10 mol%B(C 6 F 5)3提供吡咯烷的一锅合成12,是哌啶13 - 15,所述氮杂环庚烷16,异吲哚啉17,和苯并恶嗪18。
Production of Quaternary α-Aminonitriles by Means of Indium-Catalyzed Three-Component Reaction of Alkynes, Amines, and Trimethylsilyl Cyanide
A novel synthesis of α-aminonitriles is described via an indium-catalyzed three-component coupling reaction of alkynes, amines, and trimethylsilyl cyanide (Me3SiCN). Hydroamination of alkynes with a subsequent nucleophilic addition of Me3SiCN resulted in a novel approach to quaternary α-aminonitrile derivatives.