N-Acylsydnone imines, anhydro-4-N-benzoylimino-2,3-diphenylthiazolium hydroxide, and anhydro-4-N-benzoylimino-2,3-diphenyl-1-methylimidazolium hydroxide undergo 1,3-dipolar cycloaddition with dimethyl acetylenedicarboxylate with the formation of substituted pyrazoles, the thiophen and pyrrole, respectively.
K. T. Potts, S. Husain and S. Husain, J. Chem. Soc. D, 1970, 1360 DOI: 10.1039/C29700001360
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