Formal [4 + 1] Annulation of α-Arylhydrazonoketones and Dimethylsulfoxonium Methylide: One-pot Synthesis of Substituted Pyrazoles and Dihydropyrazoles
作者:Qian Zhang、Mangfei Yu、Jingwen Yuan、Rui Zhang、Yongjiu Liang、Jiamei Tian、Dewen Dong
DOI:10.1021/acs.joc.6b01127
日期:2016.7.15
A formal [4 + 1] annulation of readily available α-arylhydrazonoketones and trimethylsulfoxonium iodide in the presence of cesium carbonate is described involving a sequential Corey–Chaykovsky reaction and intramolecular nucleophilic cyclization process. Substituted pyrazoles were obtained exclusively from the reactions of α-arylhydrazono-β-oxo-amides and trimethylsulfoxonium iodide in moderate to
描述了在碳酸铯存在下,易于获得的α-芳基肼酮和碘化三甲基硫氧鎓的正式[4 +1]失效,涉及连续的Corey-Chaykovsky反应和分子内亲核环化过程。取代的吡唑仅从α-芳基肼基-β-氧代酰胺与三甲基碘化碘鎓盐的反应以中等到良好的产率获得,而α-芳基肼基-β-氧代酮/α-芳基肼基-β-氧代酯的反应以良好的收率得到相应的二氢吡唑。