Norbornene Derivatives-Controlled Palladium-Catalyzed Divergent Synthesis of Dibenzo[<i>a</i>,<i>c</i>]cycloheptenones and Fluorenones from Aryl Iodides and α-Oxocarboxylic Acids
作者:Liwei Zhou、Pengyang Jing、Zhiwei Li、Rui Liu、Jiannan Chen、Guobo Deng、Yun Liang、Yuan Yang
DOI:10.1021/acs.orglett.3c04065
日期:2024.1.26
A palladium-catalyzed divergent cascade decarboxylative annulation of aryliodides and α-oxocarboxylic acids using norbornene (NBE) derivatives as a controlled switch is reported. When NBE is used as a mediator, fluorenones are synthesized with moderate to excellent yields via a Catellani reaction that involves sequential ortho-C–H arylation and ipso-decarboxylative acylation of aryliodides. Employing
据报道,使用降冰片烯(NBE)衍生物作为受控开关,钯催化芳基碘化物和α-氧代羧酸的发散级联脱羧成环。当 NBE 用作介体时,通过 Catellani 反应以中等至优异的产率合成芴酮,该反应涉及芳基碘化物的连续邻位-C–H 芳基化和本身脱羧酰化。使用氧杂降冰片二烯 (ONBD) 代替 NBE 可以通过逆狄尔斯-阿尔德反应组装二苯并[ a , c ]环庚烯酮,而不是释放 ONBD。此外,该方法的合成效用通过产品的多样化得到证明。