1194790-95-8Relevant articles and documents
A simple approach to pyrazol-3-ones via diazenes
Burja, Bojan,Ko?evar, Marijan,Polanc, Slovenko
experimental part, p. 8690 - 8696 (2009/12/26)
An efficient entry into pyrazol-3-ones is described starting from propenoic acids that were first transformed into the corresponding hydrazides. Oxidation of the hydrazides gave the diazenes and the latter cyclized to pyrazol-3-ones on treatment with ZrCl4. The methoxycarbonyl protection of the N-1 of the pyrazolone derivatives was easily removed under mild reaction conditions.
