College of Chemistry and Environmental Science, Key Laboratory of Green Chemical Media and Reactions of Ministry of Education, Henan Normal University, Xinxiang 453007, Henan, China. jplig@163.com guohm518@hotmail.com.
Abstract:
The synthesis of fused N-heterocycles has been developed using an intramolecular cyclisation of purines or benzimidazoles. A range of medium and large rings were prepared.