Formal [7 + 2] Cycloaddition of Arynes with <i>N</i>-Vinyl-α,β-Unsaturated Nitrones: Synthesis of Benzoxazonines and Their N–O Bond Cleavage
作者:Xiao-Pan Ma、Liang-Gui Li、Hong-Ping Zhao、Min Du、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.orglett.8b01761
日期:2018.8.3
N-vinyl-α,β-unsaturated nitrones under mild conditions. Controllable N–O bond cleavage of benzoxazonines afforded polysubstituted pyrrole-tethered benzopyrans and acyclic ketone-substituted phenols in moderate to good yields. Further transformations provided a facile approach to access useful building blocks with specific stereoselectivity.
Copper-catalyzed aerobic oxidative C–O bond formation for the synthesis of 3,5-disubstituted isoxazoles from enone oximes
作者:Yadong Sun、Ablimit Abdukader、Haiyan Zhang、Wanle Yang、Chenjiang Liu
DOI:10.1039/c7ra11436b
日期:——
oxidative coupling reaction of enone oximes using a catalytic quantity of Cu(OAc)2. This method features an inexpensive metal catalyst, molecular oxygen as a green oxidant, good functional group tolerance and readily available starting materials. This attractive method for the synthesis of isoxazole derivatives is of great significance due to the product's versatile reactivity for further transformations.
TBAI-catalyzed intramolecular annulation of chalcone oximes toward isoxazoles
作者:Ablimit Abdukader、Yadong Sun、Zengpeng Zhang、Chenjiang Liu
DOI:10.1016/j.catcom.2017.11.008
日期:2018.2
A TBAI-catalyzed intramolecular annulation of chalcone oximes toward isoxazoles was developed, providing 3,5-diarylisoxazoles in good yields. Functional groups such as methoxy, ethyoxyl, chloro, bromo, fluoro and nitro were well tolerated in this reaction. Notably, the reaction ran under metal-free in water.