7-Substituted amino-2,3-dihydro-5-methyl-6-nitroimidazo[1,2-a]pyrimidines and similar pyrimido-pyrimidines are very readily cleaved by hydrazine and substituted hydrazines to give a wide range of highly substituted pyrazoles; isoxazoles similarly result from cleavage by hydroxylamine.
J. Clark and M. Curphey, J. Chem. Soc., Chem. Commun., 1974, 184 DOI: 10.1039/C39740000184
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