Gram-Scale Synthesis of Polymeric Carbon Nitride-Supported Copper: A Practical Catalyst for Ullmann-Type C—N Coupling Modifying Secondary Pyrimidin-2-amines without Additional Ligand
Yangyang Sun, Gang Feng, Chao Chen, Yonghong Liu, Xu Zhang
Chinese Journal of Organic Chemistry . 2021, (3): 1216 -1223 .  DOI: 10.6023/cjoc202009014