SYNTHESIS AND NITROGEN ELIMINATION OF THE LINEARLY FUSED TETRAZOLO(1,5-b)ISOQUINOLINIUM SALTS Formation of a new tetracycle: Indazolo(2,3-b)isoquinoline

Article abstract of DOI:10.1016/S0040-4020(01)82093-7

Treatment of 3-aminoisoquinoline (1) with aryldiazonium salts gave 2-amino-4-arylazoisoquinolines (2) which reacted with aromatic aldehyde to yield imidazo(4,5-c)isoquinolines.With 3-amino-4-methylisoquinoline (4), however, the same reaction led to 3-isoq