Tin(II)chloride catalyzed synthesis of pyranoquinolines, phenanthridinone and phenanthridine derivatives

A simple, efficient and cost-effective method for the synthesis of tetrahydropyranoquinoline derivatives by a one-pot condensation of aromatic aldehyde, aromatic amine and 3,4-dihydro-2H-pyran respectively in the presence of tin(II)chloride (SnCl2.2H2O) has been described.