3-Methoxy- and 3,5-dibromo-salicylaldehydes condense with ethyl acetoacetate in the presence of ammonium acetate to give in each case a 1,2,5,6-tetrahydropyridine as the main product, together with a [1]benzopyrano[3,4-c]pyridin-5-one.
A. Sakurai and H. Midorikawa, J. Chem. Soc., Perkin Trans. 1, 1975, 2025 DOI: 10.1039/P19750002025
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