A method for the synthesis of 5,7,8,9-tetrahydro-4H,6H-chromeno[2,3-d][1,3]oxazin-4-ones was developed. The method involves acid-catalyzed acylation of substituted ethyl 2-amino-4-aryl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carboxylates with acetic anhydride.
                                    开发了一种合成 5,7,8,9-四氢-4H,6H-色烯并[2,3-d][1,3]恶嗪-4-酮的方法。该方法包括用
乙酸酐对取代的 2-
氨基-4-芳基-5-氧代-5,6,7,8-四氢-4H-苯并
吡喃-3-
羧酸乙酯进行酸催化酰化。