A-Alkylquinoxalinium salts

Some typical examples of recently reported reactions of unsubstituted quinoxaline, hydroquinoxalines, or simple A -alkylquinoxalinium salts are mentioned here. 

Note It is axiomatic that most hydroquinoxalines can give classical A-alkyl derivatives but quinoxalines can give only A-alkylquinoxalinium salts. 

A similar cyclization has been found to take place in the reaction of N-alkylquinoxalinium salts with /S-dicarbonyl compounds, affording tetrahy-drofuro [2,3-6] quinoxalines (Scheme 34) (81H195). 

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