Volume 133, Issue 9 pp. 4664-4668
Zuschrift

Asymmetric Conjugate Addition of Chiral Secondary Borylalkyl Copper Species

Dr. Won Jun Jang

Dr. Won Jun Jang

Department of Chemistry and Institute of Basic Science, Sungkyunkwan University, Suwon, 16419 Korea

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Jeongkyu Woo

Jeongkyu Woo

Department of Chemistry and Institute of Basic Science, Sungkyunkwan University, Suwon, 16419 Korea

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Prof. Jaesook Yun

Corresponding Author

Prof. Jaesook Yun

Department of Chemistry and Institute of Basic Science, Sungkyunkwan University, Suwon, 16419 Korea

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First published: 22 November 2020
Citations: 2

Abstract

We report the diastereo- and enantioselective conjugate addition of chiral secondary borylalkyl copper species derived from borylalkenes in situ to α,β-unsaturated diesters. In the presence of a chiral bisphosphine-ligated CuH catalyst, the conjugate addition provides a direct access to enantioenriched alkylboron compounds containing two contiguous carbon stereogenic centers in good yield with high diastereo- and enantioselectivity (up to >98:2 dr, >99:1 er) by assembling readily available starting alkenyl reagents in a single operation without using preformed organometallic reagents or chiral auxiliaries. The resulting products were used in various organic transformations. The utility of the synthetic approach was highlighted by the synthesis of (−)-phaseolinic acid.

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