| Autor: |
Jeremias, Noah, Mohr, Lisa-Marie, Bach, Thorsten |
| Zdroj: |
Organic Letters; 20210101, Issue: Preprints |
| Abstrakt: |
2-Aryl-1-sulfonyl-substituted cyclobutanes were prepared in an intermolecular [2 + 2] photocycloaddition from various α,β-unsaturated sulfones and olefins upon irradiation at λ = 300 nm (26 examples, 60–99% yield). Lewis acids catalyzed the [2 + 2] photocycloaddition of 2-benzimidazolyl styryl sulfones. At short wavelengths, the latter substrates underwent C–S bond cleavage but AlBr3(5 mol %) allowed for an intermolecular reaction with 2,3-dimethyl-2-butene at longer wavelengths. A chiral-at-metal Lewis acid (2 mol %) facilitated an enantioselective reaction (up to 77% ee). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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