Abstract
A straightforward procedure has been developed for the direct synthesis of stilbenes from benzylic chlorides and alcohols. The transformation employs a two-step one-pot protocol where the benzylic chloride is first subjected to a substitution with potassium cyanide in o-xylene. Without workup, the resulting arylacetonitrile is then reacted directly with the benzylic alcohol and potassium tert-butoxide to generate the stilbene framework. The condensation has been performed with a variety of commercially available benzylic chlorides and alcohols to afford substituted stilbenes as the pure (E) isomers. A kinetic isotope effect of 5.2 has been measured for the overall transformation when comparing benzyl alcohol and α,α-d2-benzyl alcohol. The release of cyanide during the final elimination to stilbene has been confirmed by a picrate test. Thus, the potassium tert-butoxide-mediated elimination of cyanide is believed to proceed by an E1cB mechanism where the deprotonation reaction constitutes the rate-determining step.
Original language | English |
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Journal | Synthesis (Germany) |
Volume | 56 |
Pages (from-to) | A-H |
ISSN | 0039-7881 |
DOIs | |
Publication status | Published - 2024 |
Keywords
- Base-mediated coupling
- Benzylic alcohols
- Benzylic chlorides
- One-pot reaction
- Stilbenes