提出了合成甲基乙二醛1,2-双-(N,N-二甲基hydr)的方法。首次显示了其以马来酸酐为富电子二烯参与狄尔斯-阿尔德反应的可能性。在湿介质中观察到的这些试剂的第二反应是起始二烯的肼盐与马来酸的形成。通过分子能量的量子化学计算和13 C NMR化学位移的分析揭示了四种可能形式中最可能的质子化二烯结构。
提出了合成甲基乙二醛1,2-双-(N,N-二甲基hydr)的方法。首次显示了其以马来酸酐为富电子二烯参与狄尔斯-阿尔德反应的可能性。在湿介质中观察到的这些试剂的第二反应是起始二烯的肼盐与马来酸的形成。通过分子能量的量子化学计算和13 C NMR化学位移的分析揭示了四种可能形式中最可能的质子化二烯结构。
Synthesis of 2-ethoxyprop-2-enal dimethylhydrazone and its Diels-Alder reactions
作者:N. A. Keiko、T. A. Kuznetsova、L. I. Larina、Yu. A. Chuvashev、T. A. Klepikova、L. V. Sherstyannikova
DOI:10.1134/s1070428006100010
日期:2006.10
Conditions were found for the preparation of 2-ethoxyprop-2-enal dimethylhydrazone by reaction of 2-ethoxypropenal with N,N-dimethylhydrazine. 2-Ethoxyprop-2-enal dimethylhydrazone reacted with methyl vinyl ketone and methyl acrylate according to the [4+2]-cycloaddition pattern with regioselective formation of substituted tetrahydropyridines. The major product in the reaction of 2-ethoxyprop-2-enal dimethylhydrazone with 1,4-benzoquinone was 5-hydroxy-1-benzofuran-2-carbaldehyde dimethylhydrazone formed as a result of [3+2]-cycloaddition; a small amount of the corresponding [4+2]-cycloaddition product was also obtained. Some spontaneous transformations of the primary cycloaddition products were revealed.