Volume 57, Issue 14 pp. 3777-3781
Communication

Dynamic Kinetic Resolution of Heterobiaryl Ketones by Zinc-Catalyzed Asymmetric Hydrosilylation

Dr. Valentín Hornillos

Corresponding Author

Dr. Valentín Hornillos

Instituto Investigaciones Químicas (CSIC-US), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Américo Vespucio 49, 41092 Sevilla, Spain

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José A. Carmona

José A. Carmona

Instituto Investigaciones Químicas (CSIC-US), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Américo Vespucio 49, 41092 Sevilla, Spain

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Dr. Abel Ros

Dr. Abel Ros

Instituto Investigaciones Químicas (CSIC-US), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Américo Vespucio 49, 41092 Sevilla, Spain

Departamento de Química Orgánica (Universidad de Sevilla), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012 Sevilla, Spain

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Dr. Javier Iglesias-Sigüenza

Dr. Javier Iglesias-Sigüenza

Departamento de Química Orgánica (Universidad de Sevilla), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012 Sevilla, Spain

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Dr. Joaquín López-Serrano

Dr. Joaquín López-Serrano

Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA)., Universidad de Sevilla and Instituto de Investigaciones Científicas (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain

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Prof. Rosario Fernández

Corresponding Author

Prof. Rosario Fernández

Departamento de Química Orgánica (Universidad de Sevilla), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012 Sevilla, Spain

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Prof. José M. Lassaletta

Corresponding Author

Prof. José M. Lassaletta

Instituto Investigaciones Químicas (CSIC-US), Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Américo Vespucio 49, 41092 Sevilla, Spain

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First published: 13 February 2018
Citations: 106

Dedicated to Professor A. Ulises Acuña

Graphical Abstract

The dynamic duo: A nitrogen atom and the carbonyl group in heterobiaryl ketones form a Lewis pair which is responsible for the labilization of the stereogenic axis, and constitutes the key strategy for developing a zinc-catalyzed asymmetric hydrosilylation by dynamic kinetic resolution. This process simultaneously installs a stereogenic axis and a stereocenter for the highly enantioselective synthesis of heterobiaryl carbinols.

Abstract

A diastereo- and highly enantioselective dynamic kinetic resolution (DKR) of configurationally labile heterobiaryl ketones is described. The DKR proceeds by zinc-catalyzed hydrosilylation of the carbonyl group, thus leading to secondary alcohols bearing axial and central chirality. The strategy relies on the labilization of the stereogenic axis that takes place thanks to a Lewis acid–base interaction between a nitrogen atom in the heterocycle and the ketone carbonyl group. The synthetic utility of the methodology is demonstrated through stereospecific transformations into either N,N-ligands or appealing axially chiral, bifunctional thiourea organocatalysts.

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