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- W3198657204 abstract "Abstract Domino reactions of heterocyclic enamines with chromone derivatives provides a convenient synthesis of a great variety of annulated heterocyclic ring systems. The course of the reaction depends on the type of substituent located at position 3 of the chromone. Reactions of 3-unsubstituted chromones, 3-nitrochromones, and 3-halochromones proceed by conjugate addition of the carbon atom of the enamine to carbon C-2 of the chromone, ring cleavage, and recyclization via the chromone carbonyl group. In the case of 3-formylchromes, 3-dichloroacetylchromone, 3-perfluoroalkanoylthiochromones, 3-(2-fluorobenzoyl)chromones, and 3-methoxalylchromones the final cyclization proceeds via the carbonyl group located outside the chromone moiety. The functional groups located at the carbonyl group at position 3 of the chromone allow for further synthetic transformations including additional ring closures. Contents 1 Introduction 2 3-Unsubstituted Chromones 3 3-Nitrochromones 4 3-Formylchromes 5 3-Dichloroacetylchromone 6 3-Perfluoroalkanoylthiochromones 7 3-Methoxalylchromones 8 3-(2-Fluorobenzoyl)chromones 9 3-Halochromones 10 Chromone-3-carboxylic Acids 11 Conclusions" @default.
- W3198657204 created "2021-09-13" @default.
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- W3198657204 date "2021-09-02" @default.
- W3198657204 modified "2023-10-14" @default.
- W3198657204 title "Domino Reactions of Chromones with Heterocyclic Enamines" @default.
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