Finally, the amino group can be quaternized, typically by reaction with an alkyl halide or another suitable electrophile. This step converts the amine to a positively charged quaternary ammonium salt, which is the 2-aminopyrylium salt you're looking to synthesize.
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(Z/E)-5-phenoxy-5-(1H-pyrrol-1-yl)penta-2,4-dienal
(5-(4-amino-6,7-dimethoxyquinazolin-2-ylamino)-2-hydroxyphenyl)-N,N,N-trimethylmethanaminium iodide
3-carbamoyl-1-phenethyl-pyridinium; bromide
