Volume 60, Issue 52 pp. 27053-27061
Research Article

Three-Component Reaction to 1,4,2-Diazaborole-Type Heteroarene Systems

Dr. Jun Li

Dr. Jun Li

Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149 Münster, Germany

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Dr. Constantin G. Daniliuc

Dr. Constantin G. Daniliuc

Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149 Münster, Germany

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Dr. Gerald Kehr

Dr. Gerald Kehr

Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149 Münster, Germany

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Prof. Dr. Gerhard Erker

Corresponding Author

Prof. Dr. Gerhard Erker

Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149 Münster, Germany

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First published: 01 October 2021
Citations: 7

Graphical Abstract

The reaction product between the bulky FmesBH2 borane and an isonitrile serves as a B/N frustrated Lewis pair that adds nitriles to form the dihydro-1,4,2-diazaborole heteroarene derivatives. One example of this class of compounds was shown to undergo a cycloaddition reaction with N-phenylmaleimide.

Abstract

The borane FmesBH2 reacts in a three-component reaction with an isonitrile and a small series of organonitriles to give rare examples of the class of dihydro-1,4,2-diazaborole derivatives. In a related way, annulated BN-indolizine derivatives became conveniently available, as were dihydro-1,4,2-oxaza- or thiazaborole derivatives. The nucleophilic framework of a dihydro-1,4,2-diazaborole example allowed for an uncatalyzed acylation reaction. It also served as a 1,3-dipolar reagent and underwent a [3+2] cycloaddition/[4+2] cycloreversion sequence when treated with methyl propiolate to give the respective pyrrole product. The [3+2] cycloaddition product of a dihydro-1,4,2-diazaborole derivative with N-phenylmaleimide was isolated and its heterobicyclo[2.2.1]heptane derived structure characterized by X-ray diffraction.

Conflict of interest

The authors declare no conflict of interest.

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