Transition Metal-Free TEMPO-Catalyzed Oxidative Cross- Coupling of Nitrones with Alkynyl-Grignard Reagents
作者:Sandip Murarka、Armido Studer
DOI:10.1002/adsc.201100327
日期:2011.10
cross-coupling of nitrones and alkynyl-magnesium compounds using a catalytic amount of 2,2,6,6-tetramethylpiperidine-N-oxyl radical (TEMPO) as an environmentally benign organic oxidant and dioxygen as terminal oxidant is described. These coupling reactions can be performed without adding any transition metal on various N-tert-butylnitrones and alkynyl-Grignard reagents. Moreover, the alkynylated nitrone products
一种高效温和的一锅法方案,可使用催化量的2,2,6,6-四甲基哌啶-N-氧基自由基(TEMPO)作为对环境有益的有机氧化剂,并将双氧作为氮氧化物与炔基-镁化合物的交叉偶联反应描述了末端氧化剂。可以在不上的各种添加任何过渡金属来执行这些偶联反应ñ -叔butylnitrones和炔基-格利雅试剂。而且,炔基化的硝酮产物容易转化为区域异构纯的3,5-二取代的异恶唑。