Toward Continuous‐Flow Synthesis of Biologically Interesting Pyrazole Derivatives
作者:Amrita Das、Haruro Ishitani、Shū Kobayashi
DOI:10.1002/adsc.201900954
日期:2019.11.19
continuous‐flow synthesis of substituted pyrazolederivatives has been developed via the formation of vinylidene keto esters as key intermediates. Heterogeneous Ni2+‐montmorillonite was found to be an efficient catalyst for orthoester condensation of 1,3‐dicarbonyls under flow conditions. The intermediate reacted with methylhydrazine to afford pyrazolederivatives, for which suitable selection of a solvent