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DOI: 10.1055/s-0035-1561470
Synthesis of Spirocyclic and Fused Cyclic Compounds by Transition-Metal-Catalyzed Intramolecular Friedel–Crafts-Type Reactions of Phenol Derivatives
Publication History
Received: 13 April 2016
Accepted after revision: 09 May 2016
Publication Date:
25 July 2016 (online)
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Abstract
This account describes the development of novel dearomatization reactions of phenols using transition-metal-catalyzed ipso-Friedel–Crafts-type processes. In general, phenols function as O-nucleophiles in transition-metal-catalyzed allylic substitution reactions, providing the corresponding aryl ethers. We found that, however, an intramolecular ipso-Friedel–Crafts allylic alkylation of phenols proceeded smoothly in the presence of a palladium catalyst, producing various spiro[4.5]cyclohexadienone derivatives. This finding led us to launch detailed investigations into this type of reaction. Pd-catalyzed intramolecular Friedel–Crafts allylic alkylation of phenols was next examined to synthesize 10-vinyl 9,10-dihydrophenanthrene derivatives. This reaction was successfully extended to a catalytic asymmetric process. We also developed a novel synthetic method for spiro[5.5]cyclohexadienones based on a Pd-catalyzed intramolecular ipso-Friedel–Crafts-type addition of phenols to η3-propargylpalladium(II) intermediates. Mechanistic studies revealed that the present reaction proceeds through a rearomatization-assisted oxidative addition. Moreover, a Au-catalyzed intramolecular ipso-Friedel–Crafts alkenylation of phenols with a terminal alkyne is discussed.
1 Introduction
2 Pd-Catalyzed Intramolecular Friedel–Crafts Allylic Alkylation of Phenols
2.1 Synthesis of Spirocyclohexadienone Derivatives by Pd-Catalyzed Intramolecular ipso-Friedel–Crafts Allylic Alkylation of Phenols
2.2 Mechanistic Considerations
2.3 Application to Cascade Reaction Processes
2.4 Asymmetric Synthesis of Dihydrophenanthrene Derivatives by Pd-Catalyzed Asymmetric Intramolecular Friedel–Crafts Allylic Alkylation of Phenols
3 Dearomatization of Phenols by Activation of Propargyl Carbonates with a Pd Catalyst
4 Au-Catalyzed Intramolecular ipso-Friedel–Crafts Alkenylation of Phenols
5 Summary and Outlook
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For reviews, see:
For selected examples, see: Metal-mediated methods
Radical cyclization:
Halocyclization
For reviews on transition-metal-catalyzed allylic substitution reactions, see:
For reviews, see:
For reviews, see: