Nitro-facilitated '5-exo-dig' intramolecular cyclisation of 2-(2-nitrophenylethynyl)benzoic acids: A new total synthesis of indeno[1,2-b]indoles

1. Reboredo, F.J.
2. Treus, M.
3. Estévez, J.C.
4. Castedo, L.
5. Estévez, R.J.