Electrochemically-initiated Michael addition of chiral acetoacetic derivatives to methyl vinyl ketone: stereocontrolled construction of quaternary carbon centers
作者:Laura Palombi、Marta Feroci、Monica Orsini、Achille Inesi
DOI:10.1016/s0957-4166(02)00636-5
日期:2002.10
Stereoselective conjugate addition of chiral β-dicarbonyl derivatives to methyl vinyl ketone was promoted by electrolysis, using a catalytic amount of electricity. With respect to the metal-catalyzed methods, the electrochemical, metal-free conditions resulted in enhanced reactivity of the electrogenerated enolates, so that the Michael addition was found to occur under mild conditions and short reaction
通过催化作用,利用催化量的电,手性β-二羰基衍生物向甲基乙烯基酮的立体选择性共轭加成反应。关于金属催化的方法,电化学,无金属的条件导致电生成的烯醇化物的反应性增强,因此发现迈克尔加成反应在温和的条件下和较短的反应时间下进行,从而提供了具有明显非对映异构体过量的产物。当将Oppolzer的sultam用作手性诱导剂并使用延长的反应时间时,观察到立体选择性的逆转,证明了电化学诱导的加成反应和随后的热力学平衡的动力学控制。基于电化学的方法也被用于精制季生立体碳中心。