Volume 60, Issue 16 pp. 8728-8732
Communication

Synthesis of Ketones by C−H Functionalization of Aldehydes with Boronic Acids under Transition-Metal-Free Conditions

Dr. Silvia Roscales

Dr. Silvia Roscales

Instituto Pluridisciplinar, Universidad Complutense, Campus de Excelencia Internacional Moncloa, Paseo de Juan XXIII, 1, 28040 Madrid, Spain

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Prof. Dr. Aurelio G. Csáky

Corresponding Author

Prof. Dr. Aurelio G. Csáky

Instituto Pluridisciplinar, Universidad Complutense, Campus de Excelencia Internacional Moncloa, Paseo de Juan XXIII, 1, 28040 Madrid, Spain

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First published: 21 January 2021
Citations: 13

Graphical Abstract

Nitrosobenzene can simultaneously activate the C−H bonds of aldehydes and the C−B bonds of boronic acids triggering a C−C bond-forming process that leads to the synthesis of ketones via an intramolecular migration from boron to carbon. These findings constitute a transition-metal-free practical, scalable, and operationally easy method for the synthesis of ketones.

Abstract

A method for the synthesis of ketones from aldehydes and boronic acids via a transition-metal-free C−H functionalization reaction is reported. The method employs nitrosobenzene as a reagent to drive the simultaneous activation of the boronic acid as a boronate and the activation of the C−H bond of the aldehyde as an iminium species that triggers the key C−C bond-forming step via an intramolecular migration from boron to carbon. These findings constitute a practical, scalable, and operationally straightforward method for the synthesis of ketones.

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