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• W2023506874 abstract "We have reported DBU catalyzed synthesis of 4-unsubstituted 2-amino-4H-chromene-2-carbonitriles in water under reflux. The attractive features of this process are mild reaction conditions, short reaction times, easy isolation of products and good yields. 5H-chromeno[2,3-b]pyridine-3-carbonitriles were obtained by refluxing excess of malononitrile and quaternary ammonium salts in ethanol in the presence of NaOH as catalyst. The mechanisms of these reactions are believed to involve the formation of the o-quinone methide intermediate." @default.
• W2023506874 created "2016-06-24" @default.
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• W2023506874 date "2012-07-01" @default.
• W2023506874 modified "2023-09-25" @default.
• W2023506874 title "Convenient one-step synthesis of 4-unsubstituted 2-amino-4H-chromene-2-carbonitriles and 5-unsubstituted 5H-chromeno[2,3-b]pyridine-3-carbonitriles from quaternary ammonium salts" @default.
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• W2023506874 doi "https://doi.org/10.1016/j.tet.2012.04.065" @default.
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