Copper-catalyzed tandem aryl–halogen hydroxylation and CH<sub>2</sub>Cl<sub>2</sub>-based N,O-acetalization toward the synthesis of 2,3-dihydrobenzoxazinones
作者:Xuwen Chen、Wenyan Hao、Yunyun Liu
DOI:10.1039/c7ob00625j
日期:——
The concise synthesis of 2,3-dihydro-4H-benzo[e][1,3]oxazin-4-ones has been accomplished by copper-catalyzed tandem reactions of o-halobenzamides, LiOH and dichloromethane. The aryl–halogen bond hydroxylation and subsequent N,O-acetalization on CH2Cl2 are enabled under catalytic conditions which allows the generation of C(sp2)–O, C(sp3)–O and C(sp3)–N bonds to give the target products.
2,3-二氢-4 H-苯并[ e ] [1,3]恶嗪-4-酮的简明合成是通过铜催化邻卤代苯甲酰胺,LiOH和二氯甲烷的串联反应完成的。CH 2 Cl 2上的芳基-卤素键羟基化以及随后的N,O-缩醛化在催化条件下得以实现,该条件允许生成C(sp 2)-O,C(sp 3)-O和C(sp 3)- N键可提供目标产品。