Multicomponent reactions of 1,3-disubstituted 5-pyrazolones and formaldehyde in environmentally benign solvent systems and their variations with more fundamental substrates
作者:Jia-Neng Tan、Minghao Li、Yanlong Gu
DOI:10.1039/b924699a
日期:——
Many multicomponent reactions (MCRs) of 1,3-disubstituted 5-pyrazolones and formaldehyde were developed in environmentally benign solvent systems. Styrenes, vinylferrocene and 2-phenylindoles could easily react, under solvent-free conditions or in glycerol solvent, with 1,3-disubstituted 5-pyrazolones and paraformaldehyde in the absence of any catalyst to afford a variety of complex skeletons in moderate
1,3-二取代的5-吡唑啉酮和 甲醛 是在环境友好的条件下开发的 溶剂系统。苯乙烯,乙烯基二茂铁 和2-苯基吲哚在无溶剂条件下或在 甘油 溶剂,带有1,3-二取代的5-吡唑啉酮和 多聚甲醛 在没有任何 催化剂以中等到极好的产量提供各种复杂的骨架。特别地,这些MCR被证明可与由苯肼和β-酮酯合成1,3-二取代的5-吡唑酮组合使用。甘油 或一个 羧酸官能化的离子液体[MIm-CO 2 H] BF 4。因此,苯肼,β-酮酯,甲醛苯乙烯或吲哚是第一次开发。所有这些MCR都是在环境友好的条件下进行的溶剂 这些系统不仅可以最大程度地减少废物的产生,还可以简化后处理程序。