The Formation of 3-Ferrocenylpyrazole-4-Carboxylates and Alkylhydrazine Insertion Products from alpha-Ferrocenylmethylidene-beta-Oxocarboxylates

[摘要]：The reactions of alpha-ferrocenylmethylidene-beta-oxocarboxylates (1, 2, 3a, and 3b) with N-methyl- and N-(2-hydroxyethyl)hydrazines (5a, 5b) afford ethyl 1-alkyl-5-aryl(methyl)-3-ferrocenylpyrazole-4-carboxylates (6a-e) (similar to 50%) and N-alkylhydrazine insertion products, viz., ethyl (N'-acyl-N'-alkylhydrazino)-3-ferrecenylpropanoates (7a-e) (similar to 20%) and 1-acyl-2-(N'-alkyl-N'-ethoxycarbonylhydrazino)-2-ferrocenylethanes (8a-.e) (similar to 10%). The structures of the compounds obtained were established based on the spectroscopic data and X-ray diffraction analysis (for pyrazoles 6a and 6b).

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