biologically active natural products and in synthetic chemistry and in the fields of medicinal, agrochemical, cosmetic, and pigment industries. In this work, piperidine was used as a base catalyst for the convenient synthesis of 1,4‐dihydropyrano[2,3‐c]pyrazole, 5,10‐dihydro‐4H‐benzo[g]chromene, and pyrazolo[1,2‐a] [1,2,4]triazole derivatives at ambient temperature. This methodology has several advantages
含氧杂环化合物Chromenes在具有生物活性的天然产物和合成化学以及医药,农业化学,化妆品和颜料工业领域中具有“特殊”地位。在这项工作中,哌啶被用作基础催化剂,可方便地合成1,4-二氢吡喃并[2,3- c ]吡唑,5,10-二氢-4- H-苯并[ g ]色烯和吡唑并[1, 2– a ] [1,2,4]三唑衍生物在环境温度下。该方法具有许多优点,包括使用容易获得且价格便宜的催化剂,反应时间短,产率高,后处理方便以及不需要柱色谱。
Ultrasonic-Assisted One-Pot Synthesis of Pyrazolo[1,2-a][1,2,4]triazole-1,3-diones
作者:Davood Azarifar、Razieh Nejat Yami
DOI:10.3987/com-10-11959
日期:——
A facile and efficient one-pot three-component synthesis of pyrazolo[1,2-a][1,2,4]triazole-1,3-diones via condensation reaction between malononitrile, 4-phenylurazole and aromatic aldehydes in ethanol under the catalytic effect of triethylamine and ultrasonic-irradiation conditions has been explored. The advantages of this protocol include a simple workup, high rates, use of inexpensive non-toxic catalyst
Nanostructural Cu-Doped ZnO Hollow Spheres as an Economical and Recyclable Catalyst in the Synthesis of 1<i>H</i>-pyrazolo[1,2-<i>b</i>]phthalazine-5,10-diones and Pyrazolo[1,2-<i>a</i>][1,2,4]triazole-1,3-diones