A variety of ketonitrones were synthesized in moderate to excellent yields with high chemo-, regio-, and stereoselectivity by using carbonyl-directed addition of N-alkylhydroxylamines to unactivated alkynes under mild conditions. The product diverisity could be controlled by the use of different bases, and EtN(n-Pr)2 could promote the formation of ketonitrones while using EtONa as base led to indanone-derived
通过在温和的条件下使用N-烷基
羟胺的羰基定向加成反应,以中等至优异的产率合成了多种酮硝基酮,具有较高的
化学,区域和立体选择性。可以通过使用不同的碱来控制产物的剥离性,而以EtONa为碱生成
茚满酮衍生的硝酮时,EtN(n -Pr )2可以促进酮硝酮的形成。对照实验表明,除吸电子基团以外,底物的羰基起H键受体的作用,共轭烯酮骨架具有高选择性。