Synthesis of New 2-Substituted 5-Hydroxypyrano[2,3-d][1,3]oxazine-4,7-diones
摘要:
The reaction of carboxylic acid amides with malonyl chloride in acetonitrile or tetrahydrofuran without heating leads to the formation of previously unknown 2-substituted 5-hydroxypyrano[2,3-d][1,3]oxazines. The structure of the obtained compounds was established by high resolution mass spectrometry, NMR spectroscopy, and X-ray analysis.