Abstract A new series of 2,3-disubstituted-5-oxochromeno[2,3-b]pyridine derivatives has been obtained throughout a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-catalyzed reaction of 4-oxo-4H-chromene-3-carbonitrile with various active methyl and methylene compounds. The Friedländer reaction of 2-amino-4-oxo-4H-chromene-3-carboxaldehyde with the same active methyl and methylene compounds led to the identical products, suggesting that basic catalyzed ring rearrangement took place during the course of reaction.

中文翻译：

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来自 4-Oxo-chromene-3-carbonitrile 基本重排的新型 Chromeno[2,3-b] 吡啶

摘要 通过 1,8-二氮杂双环[5.4.0]十一碳-7-烯 (DBU) 催化反应，获得了一系列新的 2,3-二取代-5-氧代色基[2,3-b]吡啶衍生物。 4-oxo-4H-chromene-3-carbonitrile 与各种活性甲基和亚甲基化合物。2-amino-4-oxo-4H-chromene-3-carboxaldehyde 与相同的活性甲基和亚甲基化合物的 Friedländer 反应产生相同的产物，表明在反应过程中发生了碱性催化的环重排。