The first earth-abundant cobalt-catalyzed cycloamination of indolylquinones and various (hetero)aromatic amine under ligand-free conditions for the synthesis of polycyclic N-heterocycles has been developed. The process allows facile access to polycyclic N-heterocycles with tolerance of chloride, bromide, amino, thio, etc. groups in moderate to high yields (up to 89%). In addition, The photophysical properties of the synthesized products were evaluated. These products exhibit interesting fluorescence properties, which is promising for fluorescent probes.

中文翻译：

---

钴催化的环化作用：多环N-杂环的合成和光物理性质。

已经开发了在无配体条件下的吲哚基醌和各种（杂）芳族胺的第一个地球上富钴的环胺化反应，用于合成多环N-杂环。该方法允许以中等至高产率（高达89％）容易地获得具有氯，溴，氨基，硫代等基团的耐受性的多环N-杂环。另外，评价了合成产物的光物理性质。这些产品表现出令人感兴趣的荧光特性，这对于荧光探针是有希望的。