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Highly diastereoselective preparation of chiral NHC-boranes stereogenic at the boron atom

Abstract : Stereogenic main group elements are clearly generating interest in the enantioselective catalysis field. Surprisingly, while chiral organoboron reagents are very useful in stereoselective transformations, few scaffolds stereogenic at boron and configurationally stable have been reported to date. Herein, we describe an original library of chiral NHC-boranes, stereogenic at the boron atom, that has been prepared in only a few steps and in good yields (up to 93%). Key steps involve a chlorination/arylation sequence in the presence of simple Grignard reagents from bicyclic NHC-boranes. The high and unprecedented diastereoselectivity observed during the second step (up to 99:1 dr) has been rationalized through a plausible SRN1 mechanism thanks to EPR observations and DFT calculations.
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https://hal.archives-ouvertes.fr/hal-02149393
Contributor : Carlotta Figliola Connect in order to contact the contributor
Submitted on : Thursday, June 6, 2019 - 1:18:39 PM
Last modification on : Sunday, June 26, 2022 - 2:38:45 AM

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Clara Aupic, Amel Abdou Mohamed, Carlotta Figliola, Paola Nava, Beátrice Tuccio, et al.. Highly diastereoselective preparation of chiral NHC-boranes stereogenic at the boron atom. Chemical Science , The Royal Society of Chemistry, 2019, 10 (26), pp.6524-6530. ⟨10.1039/C9SC01454C⟩. ⟨hal-02149393⟩

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