Synthesis of 1,4,5,6-tetrahydropyridazines and pyridazines <i>via</i> transition-metal-free (4 + 2) cycloaddition of alkoxyallenes with 1,2-diaza-1,3-dienes
作者:Qi Wu、Pan-Lin Shao、Yun He
DOI:10.1039/c9ra02712b
日期:——
We developed an economical and practical protocol for the synthesis of 1,4,5,6-tetrahydropyridazines. A diverse range of alkoxyallenes and 1,2-diaza-1,3-dienes undergo (4 + 2) cycloaddition to generate the desired products in excellent yields. The high efficiency, wide substrate scope and good functional group tolerance of this process, coupled with operational simplicity, render the method synthetically
我们开发了一种经济实用的 1,4,5,6-四氢哒嗪合成方案。各种烷氧基丙二烯和 1,2-二氮杂-1,3-二烯经过 (4 + 2) 环加成反应,以优异的收率生成所需的产物。该工艺的高效率、宽底物范围和良好的官能团耐受性,加上操作简单,使该方法具有综合吸引力。从 1,4,5,6-四氢哒嗪制备各种哒嗪也证明了环加成的效用。