Volume 132, Issue 20 pp. 7897-7903
Forschungsartikel

Synthesis and Functionalization of Allenes by Direct Pd-Catalyzed Organolithium Cross-Coupling

Dr. Jaime Mateos-Gil

Dr. Jaime Mateos-Gil

Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands

These authors contributed equally to this work.

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Anirban Mondal

Anirban Mondal

Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands

These authors contributed equally to this work.

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Dr. Marta Castiñeira Reis

Dr. Marta Castiñeira Reis

Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands

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Prof. Dr. Ben L. Feringa

Corresponding Author

Prof. Dr. Ben L. Feringa

Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands

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First published: 20 February 2020
Citations: 7

Abstract

A palladium-catalyzed cross-coupling between in situ generated allenyl/propargyl-lithium species and aryl bromides to yield highly functionalized allenes is reported. The direct and selective formation of allenic products preventing the corresponding isomeric propargylic product is accomplished by the choice of SPhos or XPhos based Pd catalysts. The methodology avoids the prior transmetalation to other transition metals or reverse approaches that required prefunctionalization of substrates with leaving groups, resulting in a fast and efficient approach for the synthesis of tri- and tetrasubstituted allenes. Experimental and theoretical studies on the mechanism show catalyst control of selectivity in this allene formation.

Conflict of interest

The authors declare no conflict of interest.

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