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首页> 外文期刊>RSC Advances >Nano alpha-Al2O3 supported ammonium dihydrogen phosphate (NH4H2PO4/Al2O3): preparation, characterization and its application as a novel and heterogeneous catalyst for the one-pot synthesis of tetrahydrobenzo[b] pyran and pyrano[2,3-c]pyrazole derivatives
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Nano alpha-Al2O3 supported ammonium dihydrogen phosphate (NH4H2PO4/Al2O3): preparation, characterization and its application as a novel and heterogeneous catalyst for the one-pot synthesis of tetrahydrobenzo[b] pyran and pyrano[2,3-c]pyrazole derivatives

机译：纳米α-Al2O3负载的磷酸二氢铵（NH4H2PO4 / Al2O3）的制备，表征及其在单锅合成四氢苯并[b]吡喃和吡喃并[2,3-c]吡唑衍生物中的应用

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摘要

A simple, efficient, and environmentally benign route was developed for the preparation of 2-amino-3-cyano-4-aryl-7,7-dimethyl-5,6,7,8-tetrahydrobenzo[b]pyrans and 6-amino-5-cyano-4-aryl-1,4-dihydropyrano[2,3-c]pyrazoles from the condensation of various aldehydes, malononitrile, and 1,3-dicarbonyl compounds (1,3-cyclohexanedione or 5,5-dimethyl-1,3-cyclohexanedione) or 3-methyl-1-phenyl-2-pyrazoline-5-one, using NH4H2PO4/Al2O3 with good yields. The use of easily available catalyst, shorter reaction times, better yields, the simplicity of the reaction, the heterogeneous system, and the easy work up are the advantages of the present method. Characterization of the catalyst was performed by FT-IR spectroscopy, X-ray diffraction (XRD) techniques, thermal analysis (TG/DTG) and Transmission electron microscopy (TEM).
机译：为制备2-氨基-3-氰基-4-芳基-7,7-二甲基-5,6,7,8-四氢苯并[b]吡喃和6-氨基开发了一种简单，有效且环境友好的方法来自各种醛，丙二腈和1,3-二羰基化合物（1,3-环己二酮或5,5-二甲基）缩合的-5-氰基-4-芳基-1,4-二氢吡喃[2,3-c]吡唑-1,3-环己二酮）或3-甲基-1-苯基-2-吡唑啉-5-酮，使用NH4H2PO4 / Al2O3具有良好的收率。使用容易获得的催化剂，更短的反应时间，更好的产率，反应的简单性，非均相系统和容易的后处理是本方法的优点。通过FT-IR光谱，X射线衍射（XRD）技术，热分析（TG / DTG）和透射电子显微镜（TEM）进行催化剂的表征。

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