Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
A convenient synthesis of the fluorenylidene and the 4,5-diazafluorenylidene moiety is described. The palladium-catalyzed coupling of 6,6′-dimethyl-2,2′-bipyrdine-3,3′-diyl bis(triflate) (2) with phenylacetylene leads to the 4,5-diazafluorenylidene compound 4 as the major reaction product by an intramolecular cyclization. Under the same conditions biphenyl-2,2′-diyl bis(triflate) (6) gives the threefold coupling product 7. The connectivity of 4 and 7 is confirmed by crystal structure analysis.
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