2-methylpyridinium salts as 1,4-dinucleophiles. IV, Westphal condensation with 2-alkyl-1-aminoazinium substrates

Condensation of 2-alkyl-1-aminopyridinium, quinolinium or 1-alkyl-2-aminoisoquinolinium salts with 1,2-acenaphthenequinone or 9,10-phenanthrenequinone in the presence of base, gave pyrido [1,2-b] pyridazinium salts in good yields