A Novel One-Pot, Three-Component Synthesis of 5-Imino-2,3,5,8-tetrahydropyrazolo[1,2-a]pyridazin-1-one Derivatives
作者:Yong-Min Liang、Bo Qian、Ming-Jin Fan、Yong-Xin Xie、Lu-Yong Wu、Yun Shi
DOI:10.1055/s-0028-1088070
日期:2009.5
It was found that the zwitterionic intermediate obtained from the addition of isocyanides to dimethyl acetylenedicarboxylate could react with 1,3-dipolar compounds under mild conditions to produce 5-imino-2,3,5,8-tetrahydropyrazolo[1,2-a]pyridazin-1-one derivatives in high yields. A plausible mechanism was also discussed for this process.
研究发现,由异氰与丙二酸二甲酯加成得到的杂化中间体在温和条件下可与1,3-偶极化合物反应,高产率地生成5-亚胺基-2,3,5,8-四氢吡唑并[1,2-a]哒嗪-1-酮类衍生物。该过程的可能机理也得到了讨论。