A copper-catalyzed multicomponent oxysulfonylation of alkenes with cyclobutanone oxime esters and hydroxamicacids via the insertion of sulfur dioxide has been developed. This reaction uses K2S2O5 as the sulfur dioxide surrogate and the in situ generated amidoxyl radical as radical interceptor, thus providing a direct approach to β-amidoxy sulfones in 35–90% yields. Mechanistic studies revealed that
已经开发了通过插入二氧化硫的铜催化的烯烃与环丁酮肟酯和异羟肟酸的多组分氧磺酰化反应。该反应使用 K 2 S 2 O 5作为二氧化硫替代物,并使用原位生成的胺氧基自由基作为自由基拦截剂,从而以 35-90% 的收率直接制备 β-胺氧基砜。机理研究表明,烷基自由基和氨氧基自由基的自由基-自由基偶联反应可能参与了这种转化。
Rearrangement Strategy for the Synthesis of 2-Aminoanilines
作者:Achim Porzelle、Michael D. Woodrow、Nicholas C. O. Tomkinson
DOI:10.1021/ol100196a
日期:2010.4.2
Treatment of N-aryl hydroxylamines with trichloroacetonitrile in the presence of Imidazole provides a simple and effective method for the preparation of synthetically versatile 2-aminoanilines. Reactions proceed in DMF at 40 degrees C, providing the products in up to 86% isolated yield.