AbstractIn recent years, there has been a concerted drive to develop methods that are greener and more sustainable. Being an earth‐abundant transition metal, cobalt offers an attractive substitute for commonly employed precious metal catalysts, though reactions engaging cobalt are still less developed. Herein, we report a method to achieve the decarboxylative allylation of nitrophenyl alkanes, nitroalkanes, and ketones employing cobalt. The reaction allows for the formation of various substituted allylated products in moderate‐excellent yields with a broad scope. Additionally, the synthetic potential of the methodology is demonstrated by the transformation of products into versatile heterocyclic motifs. Mechanistic studies revealed an in situ activation of the Co(II)/dppBz precatalyst by the carboxylate salt to generate a Co(I)‐species, which is presumed to be the active catalyst.
摘要 近年来,人们一直致力于开发更环保、更可持续的方法。
钴是一种富含地球的过渡
金属,可替代常用的
贵金属催化剂,但目前利用
钴进行的反应还不太成熟。在此,我们报告了一种利用
钴实现
硝基苯基烷、硝基烷和酮的脱羧烯丙基化的方法。该反应可生成各种取代的烯丙基化产物,产率适中,范围广泛。此外,该方法的合成潜力还体现在将产物转化为多功能杂环基团上。机理研究表明,Co(II)/dppBz 前催化剂被
羧酸盐原位活化,生成了 Co(I)-species (推测为活性催化剂)。