A method for producing substituted 4H-1,3-benzoxazines and their fused derivatives bearing N,N-dimethylamino moiety in the position 2 of 4H-1,3-oxazine ring from phenolic and naphtholic Mannich bases, their iodomethylates or salicylic alcohols, and 1,1,3,3-tetramethylguanidine has been developed. This reaction is supposed to proceed via the generation of o-quinone methides followed by [4+2]-cycloaddition and elimination of dimethylamine.
本研究开发了一种方法,用于从
酚类和
萘类曼尼希碱、其
碘甲酸酯或
水杨醇以及 1,1,3,3-
四甲基胍中生产取代的 4H-1,3-苯并噁嗪及其在 4H-1,3-噁嗪环的第 2 位含有 N,N-二甲基
氨基的融合衍
生物。该反应应该是通过生成邻醌甲酰胺,然后进行[4+2]-环加成反应并消除
二甲胺。