Copper-Catalyzed TEMPO Addition to Propargyl Alcohols for the Synthesis of Vinylic Alkoxyamines
作者:Ye-Won Kang、Yoon-Jeong Choi、Hye-Young Jang
DOI:10.1021/ol502341f
日期:2014.9.19
A variety of vinylic alkoxyamines derived from propargyl alcohols and 2,2,6,6-tetramethylpiperidine N-oxyl (TEMPO) were synthesized in good yields under copper-catalyzed aerobic conditions. A reaction mechanism was proposed, involving the isomerization of propargyl radicals to allenic radicals, and related mechanistic studies were performed. The kinetic isotope effect on the propargyl C–H bond cleavage
在铜催化的需氧条件下,以高收率合成了各种衍生自炔丙醇和2,2,6,6-四甲基哌啶N-氧基(TEMPO)的乙烯基烷氧基胺。提出了一种反应机理,涉及将炔丙基自由基异构化为烯丙基自由基,并进行了相关的机理研究。观察到了动力学同位素对炔丙基CH键断裂(α-去质子化)反应的影响(k H / k D = 3.76)。