(E)-2-(2-Oxobut-3-enyl)pyridine 21, (E)-2-(but-1-en-3-ynyl)pyridine 7 and (E)-2-(buta-1,3-dienyl)pyridine 15 are precursors for 2-pyridyl etheno-bridged isoxazoles and thiazoles, and a range of specifically reduced variants.
M. M. Campbell, N. D. P. Cosford, D. R. Rae and M. Sainsbury, J. Chem. Soc., Perkin Trans. 1, 1991, 765 DOI: 10.1039/P19910000765
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