Palladium-catalyzed cyclization of o-alkynyltrifluoroacetanilides followed by isocyanide insertion: synthesis of 2-substituted 1H-indole-3-carboxamides
A base-controlled synthesis of 2-substituted secondary and tertiary 1H-indole-3-carboxamides through PdCl2-catalyzed cyclization of o-alkynyltrifluoroacetanilides followed by isocyanide insertion has been developed. The reaction proceeds smoothly at ambient temperature using O2 in air as the sole oxidant of the palladium catalyst.
Aminopalladation-Triggered Carbene Insertion Reaction: Synthesis of 2-(1<i>H</i>-Indol-3-yl)acetates
作者:Ziwei Hu、Shuang Luo、Qiang Zhu
DOI:10.1002/adsc.201400799
日期:2015.3.23
red carbeneinsertionreaction for the synthesis of C‐3 alkylated indole derivatives from ortho‐alkynyltrifluoroacetanilides and α‐diazoacetates is presented; it involves a palladium catalyst and a weak base in the open air. Yields range from 49–88% with excellent functional group tolerance. The reaction proceeds through intramolecular aminopalladation of alkynes followed by carbeneinsertion. Migratory
<b>Preparation of Indoles from </b>
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<b>-Alkynyltrifluoroacetanilides Through the Aminopalladation-Reductive Elimination Process</b>
作者:Sandro Cacchi、Giancarlo Fabrizi、Luca Parisi
DOI:10.1055/s-2004-815993
日期:——
The functionalized pyrrole nucleus contained in the indole system has been assembled via the palladium-catalyzed reaction of o-alkynyltrifluoroacetanilides with organic halides/triflates or allyl carbonates. In the presence of carbon monoxide, a three-component reaction can take place and indole derivatives incorporating a molecule of carbon monoxide have been obtained.
Palladium-Catalyzed Cyclization of <i>N</i>-Acyl-<i>o</i>-alkynylanilines with Isocyanides Involving a 1,3-Acyl Migration: Rapid Access to Functionalized 2-Aminoquinolines
the synthesis of functionalized 2-aminoquinolines via palladium-catalyzed annulation of N-acyl-o-alkynylanilines with isocyanides has been developed with high atom economy, in which an unconventional 6-endo-dig cyclization process is observed. Furtherinvestigations of the mechanism demonstrated that an intramolecular acyl migration of the N-protecting groups was involved in this transformation.
Cascade cyclocarbopalladation of the readily available aryl/alkyl-substituted propargylic amides containing an aryl iodide moiety, followed by Suzuki–Miyaura coupling with arylboronic acids, allowed an efficient regio- and stereoselective synthesis of tetrasubstituted 4-methylene-3,4-dihydroisoquinolin-1(2H)-ones. Moreover, cascade cyclocarbopalladation, followed by the reaction with 2-alkynyltrifluoroacetanilides