Volume 60, Issue 10 pp. 5475-5481
Research Article

Low-Temperature Intramolecular [4+2] Cycloaddition of Allenes with Arenes for the Synthesis of Diene Ligands

Dr. Durga Prasad Hari

Dr. Durga Prasad Hari

Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland

Present address: School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

These authors contributed equally to this work.

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Guillaume Pisella

Guillaume Pisella

Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland

These authors contributed equally to this work.

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Dr. Matthew D. Wodrich

Dr. Matthew D. Wodrich

Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland

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Artem V. Tsymbal

Artem V. Tsymbal

Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland

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Dr. Farzaneh Fadaei Tirani

Dr. Farzaneh Fadaei Tirani

Institute of Chemistry and Chemical Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC-GE, BCH 2111, 1015 Lausanne, Switzerland

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Dr. Rosario Scopelliti

Dr. Rosario Scopelliti

Institute of Chemistry and Chemical Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC-GE, BCH 2111, 1015 Lausanne, Switzerland

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Prof. Dr. Jerome Waser

Corresponding Author

Prof. Dr. Jerome Waser

Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 1402, 1015 Lausanne, Switzerland

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First published: 20 November 2020
Citations: 28

Graphical Abstract

A highly efficient strategy for the rapid assembly of bicyclooctadienes starting from simple diazo esters and EBX reagents through a one-pot sequential oxyalkynylation/ [4+2] allene-arene cycloaddition reaction at low temperature (23–90 °C) is reported. The obtained products are good chiral ligands for rhodium-catalyzed conjugate addition.

Abstract

The intramolecular [4+2] cycloaddition between arenes and allenes first reported by Himbert gives rapid access to rigid polycyclic scaffolds. Herein, we report a one-pot oxyalkynylation/cycloaddition reaction proceeding under mild conditions (23–90 °C) and providing complex polycyclic architectures with high efficiency, and atom and step economy. The bicyclo[2.2.2]octadiene products were obtained with a wide variety of useful functional groups and were successfully applied as chiral ligands for metal catalysis. Computational studies gave a first rationalization of the low activation energy for the cycloaddition based on counter-intuitive favorable dispersive interactions in the transition state.

Conflict of interest

The authors declare no conflict of interest.

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