Key Laboratory for Green Organic Synthesis and Application of Hunan Province;
Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education;
College of Chemistry;
Xiangtan University;
Xiangtan 411105;
China;
School of Chemistry and Chemical Engineering;
Henan Normal University;
Xinxiang 453007;
China;
Nitrogen-heterocycle; O-Acyl ketoximes; Annulations; Copper catalysis; Metal-free; Multi-component;