Temperature‐Controlled Stereodivergent Synthesis of 2,2′‐Biflavanones Promoted by Samarium Diiodide
作者:Martín Soto、Raquel G. Soengas、Artur M. S. Silva、Vicente Gotor‐Fernández、Humberto Rodríguez‐Solla
DOI:10.1002/chem.201902927
日期:2019.10.11
In this work, the first example of a radical stereodivergent reaction directed towards the stereoselective synthesis of both (R*,R*)- and (R*,S*)-2,2'-biflavanones promoted by samarium diiodide is reported. Control experiments showed that the selectivity of this reaction was exclusively controlled by the temperature. It was possible to generate a variety of 2,2'-biflavanones bearing different substitution
在这项工作中,报道了针对由二碘化promote促进的(R *,R *)-和(R *,S *)-2,2'-双黄烷酮的立体选择性合成的自由基立体发散反应的第一个例子。对照实验表明,该反应的选择性完全受温度控制。可以以良好的定量产率产生多种在芳环上带有不同取代模式的2,2'-双黄酮,这两种化合物都是所需化合物的立体异构体,可以完全或高度地控制选择性。还讨论了解释相应的2,2'-双黄烷酮的生成和选择性的机理。通过单晶X射线衍射实验明确阐明了每种异构体的结构和立体化学测定。