Brønsted Base-Catalyzed One-Pot Three-Component Biginelli-Type Reaction: An Efficient Synthesis of 4,5,6-Triaryl-3,4-dihydropyrimidin-2(1<i>H</i>)-one and Mechanistic Study
作者:Zhi-Liang Shen、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1021/jo902394y
日期:2010.2.19
t-BuOK (20 mol %) is described. The reactions proceeded efficiently at 70 °C to afford the desired products in moderate to good yields. Detailed mechanistic study shows that the Biginelli-type reaction using urea and thiourea proceeds through two totally different pathways. Enone 5 and bis-urea 8 were highly suggested as respective reaction intermediates for reactions involving thiourea and urea as substrates
通过一锅中醛,2-苯基苯乙酮和脲/硫脲的三组分Biginelli型缩合反应,有效地一锅合成4,5,6-三芳基-3,4-二氢嘧啶-2(1 H)-描述了催化量的t- BuOK(20mol%)的存在。反应在70°C下有效地进行,以中等至良好的产率提供所需的产物。详细的机理研究表明,使用尿素和硫脲的Biginelli型反应通过两种完全不同的途径进行。强烈建议将烯酮5和双脲8用作涉及硫脲和尿素作为底物的反应的各自反应中间体。