1. Russel DK, Press JB (1996) Five-membered rings with one heteroatom and fused carbocyclic derivatives. In: Katritzky AR, Rees CW, Scriven EFV (eds) Comprehensive heterocyclic chemistry II, vol 2. Oxford, Pergamon, p 680
2. Schatz J, Brendgen T, Schühle D (2008) Five-membered rings with one heteroatom together with their benzo and other carbocyclic-fused derivatives. In: Katritzky AR, Ramsden CA, Scriven EFV, Taylor RJK (eds) Comprehensive heterocyclic chemistry III, vol 3. Oxford, Elsevier, Amsterdam, p 932
3. Wang L, He W, Yu Z (2013) Chem Soc Rev 42:599
4. Grochowski MR, Li T, Brennessel WW, Jones WD (2010) J Am Chem Soc 132:12412
5. Tan R, Song D (2011) Organometallics 30:1637