A continuous-flow procedure for the synthesis of 4-Benzylidene-pyrazol-5-one derivatives

A continuous-flow procedure for the synthesis of 4-Benzylidene-pyrazol-5-one derivatives
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4-亚苄基-吡唑-5-酮衍生物的连续流程合成

DOI:
10.1007/s41981-018-0003-8
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发表时间:
2018-03
影响因子:
2.7
通讯作者:
Lv Yanwen
Lv Yanwen
中科院分区:
化学3区
文献类型:
--
作者:
Yu Jiangang;Xu Jianguo;Li Jie;Jin Yi;Xu Wanghui;Yu Zhiqun;Lv Yanwen

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建立了一种两步流动反应器,用于快速合成4-亚苄基吡唑-5-酮衍生物。该方法包括芳香肼/β-酮酯的环化和随后与芳香醛的Knoevenagel缩合反应,而无需分离中间体。通过在相对高的温度下进行该反应,将停留时间减少到总共小于2分钟。因此,以中等至优异的产率获得并分离了15个样品。
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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