A green and sustainable direct dehydrative amination of alcohols, catalyzed by cobalt(II)/TPPMS (sodium diphenylphosphinobenzene‐3‐sulfonate) in water, is described.
We have developed a novel strategy for the direct substitution of benzyl alcohols with anthranilic acids using water‐soluble coppercatalysts through a radical pathway in water, which offers efficient and environmentally friendly N‐, S‐, and C‐benzylations under neutral conditions. Radical scavengers strongly inhibited the benzylation. Radical clock experiments using α‐cyclopropylbenzyl alcohol were
我们已经开发出一种新的策略,可以通过水溶性铜催化剂通过水中的自由基途径用邻氨基苯甲酸直接取代苯甲醇,从而在中性条件下提供有效且环保的N-,S-和C-苄基化作用。自由基清除剂强烈抑制苄基化。进行了使用α-环丙基苄醇的自由基钟实验,以观察环丙基甲基自由基向烯丙基甲基自由基的快速异构化。Hammett图可以拟合为包含自由基和极性贡献的两个参数的Hammett关系[log(k X / k H)=-1.24σ 。–0.38σ,R2 = 0.99]。相对参数ρ 。3.3的/ρ表明,这些反应涉及强自由基基团,在过渡态时极性影响较小。
Chemoselective Benzylation of Unprotected Anthranilic Acids with Benzhydryl Alcohols by Water-Soluble Au(III)/TPPMS in Water
A novel and efficient method for the benzylation of unprotected anthranilic acids with benzhydryl alcohols using water-soluble Au(III)/TPPMS in water is developed. Water plays an important role in our catalytic system. This new protocol could be used for not only N-benzylation, but also chemoselective C-benzylation by the Friedel-Crafts reaction.