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.