Summary
Protonation of the reactive intermediates produced in the reaction between alkyl(aryl) isocyanides and dialkyl acetylenedicarboxylates by indan-1,3-dione leads to vinylnitrilium cations, which undergo carbon centered Michael type addition with the conjugate base of the CH-acid to produce functionalized 5-oxo-4,5-dihydroindeno[1,2-b]pyrans.
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Yavari, I., Sirouspour, M. & Souri, S. Three-component synthesis of functionalized 5-oxo-4,5-dihydroindeno[1,2-b]pyrans. Mol Divers 10, 265–270 (2006). https://doi.org/10.1007/s11030-006-9022-8
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DOI: https://doi.org/10.1007/s11030-006-9022-8