The reactions of several 2- and 3-(aryliminomethyl)chromones with various chloroketens have been investigated. Whereas the 2-substituted chromones gave 2-(4-oxoazetidin-2-yl)chromones, the 3-substituted chromones yielded fused pyridone derivatives.
A. O. Fitton, J. R. Frost, P. G. Houghton and H. Suschitzky, J. Chem. Soc., Perkin Trans. 1, 1977, 1450 DOI: 10.1039/P19770001450
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