A novel method for the synthesis of 5,6-dihydro-4H-oxocin-4-ones: 6-endo-dig versus 8-endo-dig cyclizationsTetrahedron LettersN Rosas, P Sharma, C Alvarez, E Gómez, Y Gutiérrez, M Méndez, R.A Toscano, L.A Maldonado2003Article