作者:Giampaolo Giacomelli、Andrea Porcheddu、Margherita Salaris、Maurizio Taddei
DOI:10.1002/ejoc.200390091
日期:2003.2
A small parallel library of 1,4,5-trisubstituted pyrazoles was prepared in solution using a three-step procedure starting from Meldrum acid. The Meldrum acid was acylated with different acyl chlorides and the products opened with different alcohols and amines to give substituted β-keto esters and β-keto amines. Further reaction with N,N-dimethylformamide dimethylacetal and the final cyclisation were
使用三步法从 Meldrum 酸开始,在溶液中制备了一个小型的 1,4,5-三取代吡唑平行库。Meldrum酸用不同的酰氯酰化,产物用不同的醇和胺打开,得到取代的β-酮酯和β-酮胺。与 N,N-二甲基甲酰胺二甲基缩醛的进一步反应和最终的环化在微波辐射下有效地进行。在第一步中仅使用清除剂树脂,而在其他两个步骤中使用微波可以使起始材料完全转化。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)