ChemInform Abstract: Synthesis of 1,3‐Disubstituted 4‐Isonitrosopyrazol‐5‐ones from N‐Alkyl(Arylalkyl)‐N‐nitrosohydrazines.

Abstract

The reaction between the N‐nitrosohydrazines (I) and ethyl acetoacetate (II) is studied for the first time.

Oximes of five-membered heterocyclic compounds with two heteroatoms. 1. Synthesis and structure (Review)

“…In the NaNO 2 /AcOH system the imidazo[1,2-a]benzimidazole 100 gives the nitroso derivative 101, the treatment of which with an alcohol solution of alkali leads to the oxime 102 with a yield of 47% [99]. The reaction of the nitrosohydrazines and ethyl acetoacetate leads to pyrazole oximes with yields of up to 41% [101]. The pyrazolone oximes 108 were prepared successfully in a two-stage synthesis from the corresponding hydrazines 107 [102].…”