4-(Alk-2-enylamino)-2-oxo-2H-1-benzopyran-3-carbaldehyde oximes 5 underwent thermally induced 1,3-dipolar cycloaddition under mild conditions giving isoxazolo[3,4-d][1]benzopyrano[4,3-b]pyridine derivatives 6 in good yields. The features of the oxime–nitrone isomerisation and nitrone–olefin cycloaddition are discussed.
M. Gotoh, T. Mizui, B. Sun, K. Hirayama and M. Noguchi, J. Chem. Soc., Perkin Trans. 1, 1995, 1857 DOI: 10.1039/P19950001857
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