Copper(II)-Catalyzed Tandem Decarboxylative Michael/Aldol Reactions Leading to the Formation of Functionalized Cyclohexenones
作者:Jeonghyo Lee、Sibin Wang、Miranda Callahan、Pavel Nagorny
DOI:10.1021/acs.orglett.8b00607
日期:2018.4.6
followed by in situ aldolization, which results in highly functionalized chiral and achiral cyclohexenones. The achiral version of this Robinson annulation features a hitherto unprecedented Michael reaction of β-keto acids with sterically hindered β,β′-substituted enones and provides access to all carbon quaternary stereocenter-containing cyclohexenones (11 examples, 43–83% yield). In addition, an asymmetric
这项工作描述了一种新的单锅铜(II)催化的β-酮酸和烯酮之间的脱羧迈克尔反应,然后进行原位醛醇缩合反应,从而导致高度官能化的手性和非手性环己烯酮的开发。该罗宾逊环空的非手性版本具有迄今空前的β-酮酸与空间受阻的β,β'-取代的烯酮的迈克尔反应,并提供了所有含碳四元立体中心的环己烯酮的通道(11个实例,产率43-83%)。此外,还设计了一种不对称的手性双(恶唑啉)铜(II)催化的单锅罗宾逊环化法,用于制备手性环己烯酮,包括一些含有邻位立体中心的产品(5个实例,产率为65-85%,84-94% ee)。