Sugarcane Bagasse Ash-Based Silica-Supported Boric Acid (SBA-SiO2-H3BO3): A Versatile and Reusable Catalyst for the Synthesis of 1,4Dihydropyrano[2,3c]pyrazole Derivatives
作者:A. K. Pandey、A. Kumar、S. C. Shrivastava
DOI:10.1134/s1070428021040229
日期:2021.4
one-pot four-component reaction of various substituted benzaldehydes, hydrazine hydrate or phenylhydrazine, ethyl acetoacetate, and malononitrile in aqueous medium in the presence of sugarcane bagasse ash-based silica-supported boric acid (SBA-SiO2-H3BO3) as a solid acid catalyst. The advantages of this methodology are the use of cost-effective and nontoxic catalyst, short reaction time, operational simplicity
摘要 一个简单的,绿色的,高效的协议已被开发用于生物活性1,4dihydropyrano [2,3的合成Ç ]经由各种取代的苯甲醛的一锅四组分反应的吡唑衍生物,水合肼或苯肼,乙酰乙酸乙酯,和在甘蔗渣灰分基二氧化硅负载的硼酸(SBA-SiO 2 -H 3 BO 3)作为固体酸催化剂的存在下,在水性介质中制备丙二腈。这种方法的优点是使用经济高效且无毒的催化剂,反应时间短,操作简便,产率高(90-95%),二氧化硅来源的可用性和绿色方案。