Abstract
A two-step flow reactor has been set up for an expeditious synthesis of 4-benzylidene-pyrazol-5-one derivatives. This procedure involved cyclization of aromatic hydrazine/β-keto ester and subsequent Knoevenagel condensation reaction with aromatic aldehydes in tandem without isolation of intermediates. Residence time was reduced to less than 2 min in total through conducting this reaction at a relatively high temperature. Accordingly, 15 samples were achieved and isolated in moderate to excellent yields.
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Financial support from the National Science Foundation of China (21476128) is gratefully acknowledged.
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Yu, J., Xu, J., Li, J. et al. A continuous-flow procedure for the synthesis of 4-Benzylidene-pyrazol-5-one derivatives. J Flow Chem 8, 29–34 (2018). https://doi.org/10.1007/s41981-018-0003-8
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DOI: https://doi.org/10.1007/s41981-018-0003-8