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Synfacts 2019; 15(10): 1163
DOI: 10.1055/s-0039-1690959
DOI: 10.1055/s-0039-1690959
Polymer-Supported Synthesis
Stille Coupling Catalyzed by Gold Nanoparticles Formed In Situ on Active Carbon
Weitere Informationen
Publikationsverlauf
Publikationsdatum:
17. September 2019 (online)
Key words
gold catalysis - nanoparticles - Stille coupling - benzyl halides - allylstannanes - dienes
Significance
Activated-carbon-adsorbed gold nanoparticles formed in situ catalyzed the C(sp3)–C(sp3) coupling reaction of benzylic bromides with allyl(tributyl)stannanes to give the corresponding homoallylic benzenes in up to >99% yield (eq.1). This catalyst was also applicable on an allyl–allyl coupling reaction to furnish 1,5-dienes in yields of 54–59% (eq. 2).
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Comment
The coupling of (2-bromoethyl)benzene with allyl(tributyl)stannane proceeded in the presence of a 0.001 mol% loading of the gold nanoparticles to give the coupling product in 29% yield with a total turnover number of up to 29000. The catalyst was recovered by centrifugation and recycled four times without a loss of its catalytic activity.
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