Metal-Free Ring Expansions of Methylenecyclopropanes Through Nitrene Equivalent

[摘要]：An interesting nitrene equivalent mediated metal-free ring expansion of methylenecyclopropanes was developed in the presence of iodosobenzene diacetate (PIDA) and 3-amino-2-ethyl-4(3H)-quinazolinone under mild conditions. A variety of cyclobutylidene hydrazine derivatives were obtained in moderate to excellent yields as separable (Z)/(E) isomeric mixtures.

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