A reinvestigation of the reactions of 3-substituted chromones with hydroxylamine. Unexpected synthesis of 3-amino-4H-chromeno[3,4-d]isoxazol-4-one and 3-(diaminomethylene)chroman-2,4-dione
作者:Vyacheslav Ya. Sosnovskikh、Vladimir S. Moshkin、Mikhail I. Kodess
DOI:10.1016/j.tetlet.2008.09.091
日期:2008.11
Reactions of 3-substituted chromones (3-formylchromone, 3-formylchromone-3-oxime, and 3-cyanochromone) with hydroxylamine in alkaline medium were reinvestigated, and a proof of structures and a probable reaction pathway are presented. Syntheses of 2-aminochromone-3-carboxamide, 3-amino-4H-chromeno[3,4-d]isoxazol-4-one, and 3-(diaminomethylene)chroman-2,4-dione were developed.
再次研究了3-取代的色酮(3-甲酰基色酮,3-甲酰基色酮-3-肟和3-氰基色酮)与羟胺在碱性介质中的反应,并提出了结构证明和可能的反应途径。开发了2-氨基色酮-3-羧酰胺,3-氨基-4 H-色胺[3,4- d ]异恶唑-4-酮和3-(二氨基亚甲基)苯并吡喃-2,4-二酮的合成。