Volume 56, Issue 12 pp. 3182-3186
Communication

Template-Assisted meta-C−H Alkylation and Alkenylation of Arenes

Sukdev Bag

Sukdev Bag

Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076 India

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Dr. Ramasamy Jayarajan

Dr. Ramasamy Jayarajan

Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076 India

Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, India

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Rahul Mondal

Rahul Mondal

Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076 India

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Prof. Dr. Debabrata Maiti

Corresponding Author

Prof. Dr. Debabrata Maiti

Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076 India

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First published: 16 February 2017
Citations: 127

Graphical Abstract

On target: Pyrimidine-based, template-assisted meta-C−H alkylation and alkenylation with allyl alcohols and protected allyl alcohols has been developed. Sulfonyl, carbonyl, and phosphonyl esters were used as linkers between the directing group (DG) and target meta-C−H bond of arenes.

Abstract

To expand the scope of meta-functionalization, a pyrimidine-based template effective for the formation of β-aryl aldehydes and ketones, using allyl alcohols, by meta-C−H activation of benzylsulfonyl esters is described. In addition, α,β-unsaturated aldehydes were generated by in situ olefination and deprotection of allyl benzyl ethers. These new functionalizations at the meta-position of an arene have also been successfully implemented in benzylphosphonate, phenethyl carbonyl, and phenethylsulfonyl ester scaffolds. Key to these successful new functionalizations is the creation of an electropositive palladium center by accepting the electron cloud from the metal to the energetically low-lying π-orbitals of pyrimidine ring, and it favors coordination of allyl alcohol to the metal center.

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