1. A. R.Kattrizky and A. F.Pozharskii , Handbook of Heterocyclic Chemistry , Pergamon , Amsterdam , 2nd edn, 2000
2. T.Eicher and S.Hauptmann , The Chemistry of Heterocycles , Wiley-VCH , Weinheim , 2003
3. A. R.Katritzky , C. A.Ramsden , J. A.Joule and V. V.Zhdankin , Handbook of Heterocyclic Chemistry , Elsevier , Oxford , 3rd edn, 2010
4. J. J.Li , Heterocyclic Chemistry in Drug Discovery , John Wiley & Sons, Inc. , Hoboken , 2013
5. Synthesis of N‐heterocycles via [4 + 3] cycloaddition of azomethine imine