Alkoxypyrazoles and the process for their preparation
申请人:Institut Pasteur
公开号:EP2151433A1
公开(公告)日:2010-02-10
The present invention relates to a alkoxypyrazoles preparation process, and new alkoxypyrazole compounds.
本发明涉及一种烷氧基吡唑的制备方法,以及新的烷氧基吡唑化合物。
[EN] NEW ALKOXYPYRAZOLES<br/>[FR] NOUVEAUX ALCOXYPYRAZOLES
申请人:PASTEUR INSTITUT
公开号:WO2010015657A2
公开(公告)日:2010-02-11
The present invention relates to a alkoxypyrazoles preparation process, and new alkoxypyrazoles compounds.
An Improved Preparation of 3-Alkoxypyrazoles
作者:Yves Janin、Sandrine Guillou、Frédéric Bonhomme
DOI:10.1055/s-0028-1083186
日期:——
The condensation between alkyl acetoacetates and hydrazines constitutes the very well-known Knorr synthetic method leading to pyrazol-3/5-ones. However, contemporary reports describe an alternate reaction pathway leading to low yields of 3/5-alkoxypyrazoles using hydrazine salts. No general method for the selective synthesis of 3-alkoxypyrazoles has been reported to date, hence we focused on this side reaction in an attempt to turn it into the main transformation. Depending on the starting material, various 3-alkoxypyrazoles (methoxy, ethoxy, benzyloxy, isopropoxy, allyloxy) were obtained in up to 56% yield.