Volume 132, Issue 4 pp. 1471-1475
Zuschrift

Halide Anion Triggered Reactions of Michael Acceptors with Tropylium Ion

Mohanad A. Hussein

Mohanad A. Hussein

School of Chemistry, UNSW Sydney, Australia

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Dr. Uyen P. N. Tran

Dr. Uyen P. N. Tran

School of Chemistry, UNSW Sydney, Australia

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Dr. Vien T. Huynh

Dr. Vien T. Huynh

School of Chemistry, University of Sydney, Australia

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Dr. Junming Ho

Dr. Junming Ho

School of Chemistry, UNSW Sydney, Australia

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Dr. Mohan Bhadbhade

Dr. Mohan Bhadbhade

Mark Wainwright Analytical Centre, UNSW Sydney, Australia

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Prof. Dr. Herbert Mayr

Prof. Dr. Herbert Mayr

Department Chemie, LMU München, Germany

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Dr. Thanh V. Nguyen

Corresponding Author

Dr. Thanh V. Nguyen

School of Chemistry, UNSW Sydney, Australia

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First published: 01 October 2019
Citations: 4

A previous version of this manuscript has been deposited on a preprint server (https://doi.org/10.26434/chemrxiv.9639227.v1).

Abstract

Tropylium bromide undergoes noncatalyzed, regioselective additions to a large variety of Michael acceptors. In this way, acrylic esters are converted into β-bromo-α-cycloheptatrienylpropionic esters. The reactions are interpreted as nucleophilic attack of bromide ions at the electron-deficient olefins and the approach of the tropylium ion to the incipient carbanion. Quantum chemical calculations were performed to elucidate the analogy to the amine- or phosphine-catalyzed Rauhut–Currier reactions. Subsequent synthetic transformations of the bromo-cycloheptatrienylated adducts are reported.

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