Bismuth(III) Chloride-Catalyzed Intramolecular Hetero Diels-Alder Reaction: Application to the Synthesis of Tetrahydrochromano[4,3-b]quinoline Derivatives - Sabitha, Gowravaram; Reddy, Erigala Venkata; Yadav, Jhillu S (Synthesis, 2001)