Accessing benzooxadiazepines<i>via</i>formal [4 + 3] cycloadditions of aza-<i>o</i>-quinone methides with nitrones
作者:Yong-Sheng Zheng、Liang Tu、Li-Mei Gao、Rong Huang、Tao Feng、Huan Sun、Wen-Xuan Wang、Zheng-Hui Li、Ji-Kai Liu
DOI:10.1039/c8ob00201k
日期:——
An unprecedented and efficient [4 + 3] cycloaddition of N-(ortho-chloromethyl)aryl amides with nitrones has been developed. This approach provides easy access to a series of seven-membered benzooxadiazepine derivatives in good to excellent yields (up to 99% yield) under mild reaction conditions.
An effective and facile method for the synthesis of highly substituted 1,2,3,5‐tetrahydrobenzo[e][1,2,4]‐oxadiazepines is described. A formal [4+3] cycloaddition of N‐(2‐(chloromethyl) phenyl) amides with nitrones afforded benzo[e][1,2,4]‐oxadiazepine derivatives with high atom economy and excellent yields (up to 97%).
描述了一种合成高度取代的1,2,3,5-四氢苯并[ e ] [1,2,4]-恶二氮卓的有效而简便的方法。N-(2-(氯甲基)苯基)酰胺与硝酮的正式[4 + 3]环加成反应得到苯并[ e ] [1,2,4]-恶二氮杂卓衍生物,具有高原子经济性和极佳的收率(高达97%) 。
Inverse‐Electron‐Demand [4+2]‐Cycloaddition of 1,3,5‐triazinanes: Facile Approaches to Tetrahydroquinazolines
作者:Yongsheng Zheng、Liang Tu、Na Li、Rong Huang、Tao Feng、Huan Sun、Zhenghui Li、Jikai Liu
DOI:10.1002/adsc.201801063
日期:2019.1.11
unprecedented inverse‐electron‐demand [4+2] cycloaddition reaction of in situ generated aza‐o‐quinone methides with 1,3,5‐triazinanes has been developed under mild conditions, providing an efficient and mild approach to synthesize tetrahydroquinazolines in high yields (up to 99%) with excellent functional group tolerance. This protocol represents the first example of inverse‐electron‐demand [4+2] cycloaddition
A novel formal (4 + 1) annulation between N-(o-chloromethyl)aryl amides and 3-chlorooxindoles through in situ generated aza-ortho-QMs with 3-chlorooxindoles is reported for the synthesis of a series of 2,3′-spirobi (indolin)-2′-ones in high yields. Under structured illumination microscopy, compound 3a is found to change the mitochondrial morphology and induce mitophagy pathway, which might then trigger mitophagy in cancer cells.