[4+2]-Cycloaddition of 1,1,3,3-tetramethylguanidine and o-quinone methides: synthesis of arene-fused 2-dimethylamino-4H-1,3-oxazines
作者:V. A. Osyanin、D. V. Osipov、P. E. Krasnikov、V. A. Shiryaev
DOI:10.1007/s11172-022-3673-1
日期:2022.11
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。