As we know, many natural products, pharmaceuticals and agrochemicals have heterocyclic scaffolds，especially the nitrogen heterocycles. So, development of methods to construct N-heterocycles is essential for both organic and medicinal chemistry, and is still an area of intensive research. Despite great advances that have been made in this field, however, it is still highly desirable to develop new and efficient methods to synthesize N-heterocycles under sustainable and cost-effective conditions. So, our research interest is also mainly focused on this field.