1,3-Dipolar cycloaddition of dimethyl acetylenedicarboxylate to the anhydro-base of 4-hydroxy-2-methylcinnolinium hydroxide is described. Alkylation of the anhydro-base with triethyloxonium fluoroborate give 4-ethoxy-2-methylcinnolinium fluoroborate and 1-methyl-4-cinnolone similarly gives 4-ethoxy-1-methyl-cinnolinium fluoroborate.
D. E. Ames and B. Novitt, J. Chem. Soc. C, 1969, 2355 DOI: 10.1039/J39690002355
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