Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States.
J Am Chem Soc. 2014 Mar 19;136(11):4133-6. doi: 10.1021/ja500712z. Epub 2014 Mar 10.
A family of pincer-ligated cobalt complexes has been synthesized and are active for the catalytic C-H borylation of heterocycles and arenes. The cobalt catalysts operate with high activity and under mild conditions and do not require excess borane reagents. Up to 5000 turnovers for methyl furan-2-carboxylate have been observed at ambient temperature with 0.02 mol % catalyst loadings. A catalytic cycle that relies on a cobalt(I)-(III) redox couple is proposed.
已合成出一类采用夹持配体的钴配合物，并可用于杂环和芳烃的 C-H 硼化催化。钴催化剂活性高、条件温和，且无需过量硼烷试剂。在环境温度下，以 0.02 mol%的催化剂负载量，观察到对甲基呋喃-2-羧酸甲酯的最高 5000 次转化。提出了一种依赖钴（I）-（III）氧化还原对的催化循环。
