Heterocyclization of electrophilic alkenes with tetranitromethane revisited: regiochemistry and the mechanism of nitroisoxazole formation
作者:Elena B. Averina、Yuri V. Samoilichenko、Yulia A. Volkova、Yuri K. Grishin、Victor B. Rybakov、Andrei G. Kutateladze、Mikhail E. Elyashberg、Tamara S. Kuznetsova、Nikolai S. Zefirov
DOI:10.1016/j.tetlet.2012.01.039
日期:2012.3
Revised regiochemistry for the heterocyclization of electrophilic alkenes with tetranitromethane (TNM) in the presence of triethylamine, providing rapid access to nitroisoxazoles, is reported. The formation of 5-nitroisoxazoles previously incorrectly assigned as 3-nitro regioisomers, has now been established unambiguously by X-ray crystallography. Empirical computations with ACD/CNMR Predictor, based
据报道,在三乙胺的存在下,经修订的区域化学用于亲电烯烃与四硝基甲烷(TNM)的杂环化,可快速获得硝基异恶唑。现在已经通过X射线晶体学法明确地确定了以前被误认为是3-硝基区域异构体的5-硝基异恶唑的形成。使用ACD / CNMR Predictor进行的经验计算,既基于球形环境的分层排序(HOSE),又基于人工神经网络算法(ANN),还基于密度泛函理论对3-相对于5-的13 C NMR化学位移进行计算硝基异恶唑显示出与实验观察到的5-区域异构体的光谱一致。