Addition de phénylhydrazones aux olépines en milieu neutre
作者:G. Le Fevre、J. Hamelin
DOI:10.1016/0040-4020(80)80039-1
日期:1980.1
Phenylhydrazones may exhibit three types of reactivitytowards alkenes: Nucleophilicattack by carbon, nucleophilicattack by nitrogen and 1,3-dipolar cycloaddition through the azomethine imine ylide. The course of the reaction depends on the nature of the hydrazone and alkene subitituents.
Synthesis of 1,3,5-trisubstituted pyrazoles <i>via</i> 1,3-dipolar cycloaddition of nitrile imines with ninhydrin-derived Morita–Baylis–Hillman carbonates
作者:Kai-Kai Wang、Yan-Li Li、Jun Jing、Rongxiang Chen、Na-Na Zhao、Zhi-Hui Li、Ming-Yue Wang、Shuo-Ke Ji
DOI:10.1039/d2ob01253g
日期:——
An effective synthetic method for 1,3,5-trisubstituted pyrazoles via 1,3-dipolar cycloaddition reaction has been developed. This reaction could smoothly proceed between ninhydrin-derived Morita–Baylis–Hillman carbonates and nitrilimines to provide a wide scope of differently substituted pyrazoles in high yields (up to 95%). In addition, the reaction mechanism was also proposed to explain its regioselectivity