VCl3-catalyzed aza-Diels-Alder reaction: one-pot synthesis of pyrano[3,2-c]- and furo[3,2-c]quinolines - Sabitha, Gowravaram; Reddy, M. Shashi Kumar; Arundhathi, K.; Yadav, J. S. (ARKIVOC, 2006)
doi: 10.3998/ark.5550190.0007.613