Amine nucleophilic addition to nitroalkene as a new practical approach for the synthesis of fully substituted isoxazoline-N-oxide
作者:Cheng Zhong、Lekh Nath S. Gautam、Dawei Wang、Novruz G. Akhmedov、Jeffrey L. Petersen、Xiaodong Shi
DOI:10.1016/j.tet.2011.01.085
日期:2011.6
secondary amine nucleophilic addition to the nitroalkene was used to generate the active nitronate intermediate, followed by the sequential addition to aldehyde and ylide, giving the fully substituted isoxazoline-N-oxide in one-pot fashion. Mechanistic studies revealed the equilibrium nature of the diene intermediates, which provide the foundation for the asymmetric synthesis of this interesting heterocycles
使用向硝基烯烃的仲胺亲核加成生成活性的硝酸盐中间体,然后依次加成至醛和内酯,以一锅方式得到完全取代的异恶唑啉-N-氧化物。机理研究揭示了二烯中间体的平衡性质,为这种有趣的杂环的不对称合成提供了基础。