Regioselective Synthesis of 1,3,5-Tri- and 1,3,4,5-Tetrasubstituted Pyrazoles from N-Arylhydrazones and Nitroolefins
摘要:
[GRAPHICS]Two general protocols are developed for the regioselective synthesis of 1,3,5-tri- and 1,3,4,5-tetrasubstituted pyrazoles by the reaction of electron-deficient N-arylhydrazones with nitroolefins. Studies on the stereochemistry of the key pyrazolidine intermediate suggest a stepwise cycloaddition mechanism.
Synthesis of 1,3,4-Trisubstituted and 1,3,4,5-Tetrasubstituted Pyrazoles
申请人:Deng Xiaohu
公开号:US20090093637A1
公开(公告)日:2009-04-09
This invention concerns the synthesis of highly substituted pyrazoles, which are structural components of pharmacological compounds, through reaction of hydrazones with nitroolefins.
这项发明涉及高度取代吡唑的合成,这些化合物是药物化合物的结构成分,通过酰肼与硝基烯烃的反应实现。
US8071782B2
申请人:——
公开号:US8071782B2
公开(公告)日:2011-12-06
Rajarajan; Senbagam; Vijayakumar, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2016, vol. 55B, # 2, p. 197 - 206
Regioselective Synthesis of 1,3,5-Tri- and 1,3,4,5-Tetrasubstituted Pyrazoles from <i>N</i>-Arylhydrazones and Nitroolefins
作者:Xiaohu Deng、Neelakandha S. Mani
DOI:10.1021/jo7026195
日期:2008.3.1
[GRAPHICS]Two general protocols are developed for the regioselective synthesis of 1,3,5-tri- and 1,3,4,5-tetrasubstituted pyrazoles by the reaction of electron-deficient N-arylhydrazones with nitroolefins. Studies on the stereochemistry of the key pyrazolidine intermediate suggest a stepwise cycloaddition mechanism.