Preparative Organic Chemistry
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ChemInform Abstract: Nitrogen Bridgehead Compounds. Part 64. Protonation of 9-Formyltetrahydropyrido(1,2-a)pyrimidin-4-ones and Their Analogues.
First published: May 5, 1987
ChemInform Abstract
As shown by 1H, 13C, and 15N NMR, protonation of title compounds such as (I)-(III) ((E)-enolimine, enamine, (Z)-enolimine form) takes place at the formyl oxygen atom (tautomeric equilibria, substituent effects).
