A Route to Highly Functionalized Stereospecific trans-Aminated Aurones from 3-Bromoflavones with Aniline and N-Phenylurea via a Domino Aza-Michael Ring Opening and Cyclization Reactions
作者:Naseem Ahmed、Iram Parveen
DOI:10.1055/s-0037-1610662
日期:2019.2
the requirement of additives and ligands, and offers broad substrate scope. A facile cascade reaction is reported via aza-Michael addition, ring opening, and cyclization between 3-bromoflavone and aniline derivatives or N-phenylurea in the presence of KOt-Bu and CuI in DMF under mild reaction conditions. Products were obtained as stereospecific trans-aminated aurones in good to excellent yields (61–83%)
摘要 据报道,在温和的反应条件下,在KO t -Bu和CuI存在的情况下,通过aza-Michael加成,开环和3-溴黄酮与苯胺衍生物或N-苯基脲之间的环化反应,可实现简单的级联反应。产品以良好的立体效果(61-83%)获得为立体有择的反胺化的金黄色。我们的协议操作简便,操作成功,避免了添加剂和配体的需求,并提供了广泛的底物范围。 据报道,在温和的反应条件下,在KO t -Bu和CuI存在的情况下,通过aza-Michael加成,开环和3-溴黄酮与苯胺衍生物或N-苯基脲之间的环化反应,可实现简单的级联反应。产品以良好的立体效果(61-83%)获得为立体有择的反胺化的金黄色。我们的协议操作简便,操作成功,避免了添加剂和配体的需求,并提供了广泛的底物范围。