Cyclopropenes are highly strained three-membered carbocycles, which offer unique reactivity in organic synthesis. Herein, Cp*Co^III-catalyzed ring-opening isomerization of cyclopropenes to cobalt vinylcarbene has been utilized for the synthesis of multisubstituted allylarenes via directing group-assisted functionalization of C–H bonds of arenes and heteroarenes. Employing this methodology, various substituents can be introduced at all three carbons of the allyl moiety with high selectivity. The important highlights are excellent functional group tolerance, multisubstituted allylation, high selectivity, gram scale synthesis, removable directing group, and synthesis of cyclopenta[b]indoles. In addition, a potential cobaltocycle intermediate was identified and a plausible mechanism is also proposed.

中文翻译：

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（杂）芳烃与环丙烯的螯合辅助 C-H 键的钴催化多取代烯丙基化

环丙烯是高度紧张的三元碳环，在有机合成中提供独特的反应性。在此，Cp*Co ^III催化的环丙烯开环异构化成钴乙烯基卡宾已被用于通过芳烃和杂芳烃的 C-H 键的指导基团辅助功能化来合成多取代的烯丙基芳烃。采用这种方法，可以高选择性地在烯丙基部分的所有三个碳上引入各种取代基。重要的亮点是优异的官能团耐受性、多取代的烯丙基化、高选择性、克级合成、可去除的导向基团和环戊二烯[ b]的合成]吲哚。此外，还确定了一种潜在的钴环中间体，并提出了一种合理的机制。