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Catalytic Asymmetric Synthesis of Vicinal Quaternary Stereocenters Enabled by Alkylation of α,α-Disubstituted Aldehydes with 3-Bromooxindoles
- Source :
- Organic Letters; 20240101, Issue: Preprints
- Publication Year :
- 2024
-
Abstract
- An organocatalytic enantioselective alkylation of α,α-disubstituted aldehydes with 3-bromooxindoles is reported. Enantioenriched oxindoles with vicinal quaternary stereocenters are accessed by an asymmetric conjugate addition process of branched aldehydes with o-azaxylylene intermediates (indol-2-ones). Key to the success of highly diastereo- and enantioselective transformations is the combined use of a triphenylsilyl-protected β-amino alcohol catalyst derived from the spiropyrrolidine scaffold and 3,5-dinitrobenzoic acid. This study also presents a rare example of aldehyde alkylation with the formation of consecutive quaternary stereocenters.
Details
- Language :
- English
- ISSN :
- 15237060 and 15237052
- Issue :
- Preprints
- Database :
- Supplemental Index
- Journal :
- Organic Letters
- Publication Type :
- Periodical
- Accession number :
- ejs66012464
- Full Text :
- https://doi.org/10.1021/acs.orglett.4c00700