2-Bromo(chloro)-N-(2-ethoxy(methoxy)-2-oxoethyl)pyridinium halides react with (ethoxymethylidene)malononitrile and ethyl (ethoxymethylidene)cyanoacetate to afford ethyl(methyl) 2-amino-1-cyanoindolizine-3-carboxylate and ethyl(methyl) 1-cyanoindolizine- 3-carboxylate, respectively.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2015, 51(6), 560–562
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Ponomarenko, D.A., Khoroshilov, G.E. & Krasnikov, D.A. Kröhnke's salts and their ester analogs in reactions with ethoxymethylidene derivatives of CH acids. Chem Heterocycl Comp 51, 560–562 (2015). https://doi.org/10.1007/s10593-015-1736-z
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DOI: https://doi.org/10.1007/s10593-015-1736-z