New 4-Pyridyl Nonaflates as Precursors for Push–Pull Solvatochromic Dyes

Abstract

2,6-Disubstituted 4-pyridyl nonaflates including methyl, phenyl, 2-thienyl and 2-furyl groups were prepared by cyclocondensation reactions of the appropriate β-ketoenamides. Palladium-catalyzed cross-couplings (Suzuki–Miyaura, Mizoroki–Heck and Sonogashira reactions) led to buildings blocks that are direct precursors for the envisioned synthesis of push–pull solvatochromic dyes.

Key words

enamides - pyridines - cyclocondensations - nonaflates - cross-couplings

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