描述了在室温下或在MW辐射下在无溶剂条件下通过KF / Al 2 O 3促进硫醇共轭加成到柠檬醛中的通用,清洁和简便的方法。已发现相同的方案适用于苯酚与柠檬草精油(Cymbopogon citratus)的直接反应,以直接提供潜在的杀菌剂3-thiophenylcitronellal。该方法扩展到其他贫电子烯烃,效果极佳。该催化系统最多可重复使用三遍,而无需经过之前的处理并具有可比的活性。
Atom-Economic Synthesis of Functionalized Octahydroacridines from Citronellal or 3-(Phenylthio)-citronellal
作者:Raquel G. Jacob、Márcio S. Silva、Samuel R. Mendes、Elton L. Borges、Eder J. Lenardão、Gelson Perin
DOI:10.1080/00397910802663469
日期:2009.7.7
Here we present a simple, solvent-free, one-pot, hetero-Diels-Alder reaction of (R)-citronellal or 3-(phenylthio)-citronellal with arylamines using solid-supported catalyst (SiO2/ZnCl2). This general, efficient, and improved method is selective, affording preferentially new trans-fused 3-(phenylthio)-octahydroacridines (S-OHAs) in good yields. The use of microwave irradiation facilitates the procedure and accelerates the reaction.