Ring transformation of chromone-3-carboxamide |
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| Authors: | Magdy A Ibrahim |
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| Institution: | Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, 11711 Cairo, Egypt |
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| Abstract: | 4-Hydroxycoumarin-3-carboxaldehyde (5) was obtained from chromone-3-carboxaldehyde (1) via chromone-3-carboxamide (2) and 3-aminomethylene-2H-chroman-2,4-dione (3). 3-Alkylaminomethylenechroman-2,4-diones (7,8) were obtained from the reaction of primary aliphatic amines with chromone-3-carboxamide (2). Treatment of chromone-3-carboxamide with sodium methoxide gives 3-(2-hydroxybenzoyl)-2H-chromeno2,3-b]pyridine-2,5(1H)-dione (9). |
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| Keywords: | Chromone-3-carboxamide Chroman-2 4-diones 4-Hydroxycoumarin-3-carboxaldehyde Chromeno[2 3-b]pyridine |
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