为在胶束水相反应条件下以高周转率实现可持续的无铜Sonogashira交叉偶联,开发了一种可靠且通用的方案。通过使用市售的催化剂CataCXium A Pd G3和THF作为助溶剂,各种炔烃底物可以与多种芳基卤化物有效地交叉偶联,从而提高了收率并降低了催化剂的负载量。对反应参数进行了优化,以使该过程操作简单,可靠且可扩展。该方法可通过胶束水溶液反应条件获得二卤代底物的烷基化芳烃,杂环化合物和单官能化产物,并具有提高的选择性。
NHCs-mediated benzoates formation directly from aromatic aldehydes and alkyl halides
作者:Yi Li、Wenting Du、Wei-Ping Deng
DOI:10.1016/j.tet.2012.02.079
日期:2012.5
A NHCs-mediated benzoates formation was developed by treatment of aromatic aldehydes with alkylhalides in the presence of oxygen. Corresponding benzoate derivatives were obtained in high yields up to 99%. The reaction mechanism was also discussed and a NHCs-mediated O-alkylation and subsequent oxidation process was proposed.
A robust and general protocol for a sustainable copper‐free Sonogashira cross coupling under micellar aqueous reaction conditions with high turnover was developed. By using the commercially available catalyst CataCXium A Pd G3 and THF as co‐solvent, various alkyne substrates were efficiently cross‐coupled with a broad range of aryl halides, providing improved yields and low catalyst loadings. The reaction
为在胶束水相反应条件下以高周转率实现可持续的无铜Sonogashira交叉偶联,开发了一种可靠且通用的方案。通过使用市售的催化剂CataCXium A Pd G3和THF作为助溶剂,各种炔烃底物可以与多种芳基卤化物有效地交叉偶联,从而提高了收率并降低了催化剂的负载量。对反应参数进行了优化,以使该过程操作简单,可靠且可扩展。该方法可通过胶束水溶液反应条件获得二卤代底物的烷基化芳烃,杂环化合物和单官能化产物,并具有提高的选择性。