Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 3, Pages 733-737Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201804779
Keywords
bibenzothiophene; bisoxazoline; cyclization; dimerization; palladium
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Funding
- JSPS KAKENHI [JP15K07871]
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The first example of an asymmetric cyclization-dimerization of (ortho-alkynyl phenyl) (methoxymethyl) sulfides with a palladium(II) bisoxazoline (box) catalyst has been developed. The box ligand enhances the alkynophilicity of benzothienyl palladium(II) intermediate A and thus promotes coordination of the second alkyne substrate, leading to the dimerization. The characteristic properties of the box ligand were supported by density functional theory (DFT) calculations of the intermediate. Axially chiral bibenzothiophenes were obtained in good yields with good enantioselectivities.
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