A Palladium-Catalyzed Regio- and Stereoselective Four-Component Coupling Reaction

A Palladium-Catalyzed Regio- and Stereoselective Four-Component Coupling Reaction

Pd(PPh3)4 catalytically assembles sulfenamide, alkyne, carbon monoxide, and diphenyl diselenide regio- and stereoselectively in a one-pot four-component coupling reaction to yield (Z)-β-selenyl acrylamides. The reaction proceeds in good to excellent yields (60−95%) and is tolerant of a range of func...

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Veröffentlicht in:Journal of organic chemistry 2005-02, Vol.70 (3), p.785-796
Hauptverfasser: Knapton, Daniel J, Meyer, Tara Y
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Sprache:eng
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Aliphatic compounds
Chemistry
Exact sciences and technology
Organic chemistry
Preparations and properties
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Meyer, Tara Y
description Pd(PPh3)4 catalytically assembles sulfenamide, alkyne, carbon monoxide, and diphenyl diselenide regio- and stereoselectively in a one-pot four-component coupling reaction to yield (Z)-β-selenyl acrylamides. The reaction proceeds in good to excellent yields (60−95%) and is tolerant of a range of functional groups on both the nitrogen of the sulfenamide and the alkyne. Moderate selectivities ranging from 4:1 to 7:1 β-selenyl to β-sulfenyl acrylamide have been observed despite the initial concentration of 2:1 selenium to sulfur in the reaction. The chalcogeno selectivity was found to depend directly on CO pressure; increased pressure decreased selectivity for selenium over sulfur.
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subjects Aliphatic compounds
Chemistry
Exact sciences and technology
Organic chemistry
Preparations and properties
title A Palladium-Catalyzed Regio- and Stereoselective Four-Component Coupling Reaction
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