Trisannulated Benzene Derivatives by Acid Catalyzed Aldol Cyclotrimerizations of Cyclic Ketones. Methodology Development and Mechanistic Insight
作者:Aaron W. Amick、Lawrence T. Scott
DOI:10.1021/jo070080q
日期:2007.4.1
about temperature, solvent, and solubility effects. Solvents that are both polarizable and somewhat polar, e.g., o-dichlorobenzene (ODCB), work best for the aromatic ketones examined. Certain Brønsted acids were found to work better than Lewis acids as catalysts for the archetypal aldol cyclotrimerization of indanone (2) in aprotic solvents, and a strong dependence on the pKa of the acid was observed. A
为了阐明这一古老的反应的内在作用,已阐明了有助于醛醇三环化成功的几个因素。4,7-二叔丁基ac啶酮(11)作为机械探针分子的使用引起了有关温度,溶剂和溶解度影响的有趣发现。可极化且有点极性的溶剂,例如邻二氯苯(ODCB),对于所检测的芳族酮效果最佳。发现某些布朗斯台德酸在路易斯酸中作为非质子溶剂中茚满酮(2)的原型羟醛环三聚反应的催化剂效果更好,并且对p K a的依赖性强。观察到50%的酸。已显示使用对甲苯磺酸一水合物的标准化方案在许多测试案例中均能很好地工作。