New Practical Synthesis of Indazoles via Condensation of o-Fluorobenzaldehydes and Their O-Methyloximes with Hydrazine
摘要:
The reaction of o-fluorobenzaldehydes and their O-methyloximes with hydrazine has been developed as a new practical synthesis of indazoles. Utilization of the methyloxime derivatives of benzaldehydes (in the form of the major E-isomers) in this condensation effectively eliminated a competitive Wolf-Kishner reduction to fluorotoluenes, which was observed in the direct preparations of indazoles from aldehydes. Reaction of Z-isomers of methyloximes with hydrazine resulted in the formation of 3-aminoindazoles via a benzonitrile intermediate.
[EN] PROCESS FOR THE PREPARATION OF INDAZOLYL UREAS THAT INHIBIT VANILLOID SUBTYPE 1 (VR1) RECEPTORS<br/>[FR] PROCEDE DE PREPARATION D'INDAZOLYL UREES QUI INHIBENT LES RECEPTEURS VANILLOIDES DE SOUS-TYPE 1 (VR1)
申请人:ABBOTT LAB
公开号:WO2007121339A2
公开(公告)日:2007-10-25
[EN] The present invention relates to a process of preparing indazolyl ureas that are useful as antagonists of the vanilloid receptor subtype 1 (VR1). [FR] La présente invention concerne un procédé de préparation d'indazolyl urées utilisables en tant qu'antagonistes du récepteur vanilloïde de sous-type 1 (VR1).