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σ-Bond Hydroboration of Cyclopropanes

preprint
submitted on 07.01.2020 and posted on 08.01.2020 by Hiroki Kondo, Shin Miyamura, Chisa Kobayashi, Arifin, Stephan Irle, Kenichiro Itami, Daisuke Yokogawa, Junichiro Yamaguchi
Hydroboration of alkenes is a classical reaction in organic synthesis, in which alkenes react with boranes to give alkylboranes, with subsequent oxidation resulting in alcohols. The double bond (π-bond) of alkenes can be readily reacted with boranes owing to its high reactivity. However, the single bond (σ-bond) of alkanes has never been reacted. To pursue the development of σ-bond cleavage, we selected cyclopropanes as model substrates since they present a relatively weak σ-bond. Herein, we describe an iridium-catalyzed hydroboration of cyclopropanes, resulting in β-methyl alkylboronates. These unusually branched boronates can be derivatized by oxidation or cross-coupling chemistry, accessing “designer” products that are desired by practitioners of natural product synthesis and medicinal chemistry. Furthermore, mechanistic investigations and theoretical studies revealed the enabling role of the catalyst.

History

Email Address of Submitting Author

junyamaguchi@waseda.jp

Institution

Waseda University

Country

Japan

ORCID For Submitting Author

0000-0002-3896-5882

Declaration of Conflict of Interest

No competing financial interests have been declared.

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