Palladium-Catalyzed C-H Arylation/Arene Dearomatization Domino Reaction: Expeditious Access to Spiro[4,5]fluorenes
Lingbo Han1, Xin Wei1, Yi Yuan1
1Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, China.
Abstract:
A palladium-catalyzed C-H arylation/arene dearomatization of α-aryl-β-naphthol with o-dihalobenzenes was realized in a redox-neutral manner. This bimolecular domino reaction was initiated by an in situ-formed Pd(II) species generated from the dihalobenzene, followed by phenolic-group-directed C-H activation, biaryl cross-coupling, and naphthol dearomatization, thus rendering the rapid assembly of a class of spiro[4,5]fluorenes in high yields with good chemoselectivity. Remarkably, malononitrile-derived spirofluorene 6 was found to exhibit mechanoresponsive luminescence, which can be applied to optical memory devices.
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