open access

https://hdl.handle.net/2115/90186

Cu(I)-Catalyzed Enantioselective gamma-Boryl Substitution of Trifluoromethyl- and Silyl-Substituted Alkenes

英語

gem-Difluoroalkenes

2022-08-19

Wiley-Blackwell

European journal of organic chemistry

2022(31)

e202200664

Asymmetric gamma-boryl substitution of trifluoromethyl- and silyl-substituted alkenes has been investigated. A variety of substrates were reacted with bis(pinacolato)diboron in the presence of a copper(I) salt and optically active C-1 symmetric QuinoxP*-type bisphosphine ligand as the catalyst. The optically active silyl-substituted gem-difluoroallylboronates products bearing a stereogenic C-B bond, which have never been synthesized before, were obtained in good yield with high enantioselectivity (up to 83% and up to 86% ee, respectively). The resulting allylboron compounds undergo a stereoselective allylboration with a range of aldehydes to afford chiral silyl- and difluoromethylene-containing homoallylic alcohols without significant loss in their enantiomeric purity. The resulting silyl groups in the derivatives can serve as cross-coupling sites, allowing further transformation into structurally complex fluorinated chiral molecules.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: N. Oyama, S. Akiyama, K. Kubota, T. Imamoto, H. Ito, Eur. J. Org. Chem. 2022, e202200664, which has been published in final form at https://doi.org/10.1002/ejoc.202200664. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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