N-Heterocyclic Carbene-Catalyzed Formal [3+2] Annulation of Alkynyl Aldehydes with Nitrosobenzenes: A Highly Regioselective Umpolung Strategy
作者:Runfeng Han、Jing Qi、Jixiang Gu、Donghui Ma、Xingang Xie、Xuegong She
DOI:10.1021/cs400602v
日期:2013.12.6
N-Heterocyclic carbene-catalyzed formal [3+2] annulation of alkynyl aldehydes and nitrosobenzenes has been reported. This transformation provided the novel C–X bond formation under mild conditions in moderate to satisfactory yields. The catalytic protocol allows for a rapid construction of 2,5-disubstituted isoxazol-3(2H)-ones and 2,3-disubstituted isoxazol-5(2H)-ones from the same materials via a
已经报道了N-杂环卡宾催化的炔醛和亚硝基苯的正式[3 + 2]环化反应。这种转化在温和条件下以中等至令人满意的产率提供了新颖的C–X键形成。催化规程允许通过高度区域选择性的物质策略从相同的材料快速构建2,5-二取代的异恶唑-3(2H)-和2,3-二取代的异恶唑-5(2H)-。