Improved process for preparing 4-hydroxy-2-pyrrolidone

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 207/273 (2006.01)

Patent

CA 2221641

A improved process for preparing 4-hydroxy-2-pyrrolidone of the formula (see formula I) which is characterized in reacting a 4-halogeno-3-hydroxybutyrate and an alkali metal or alkaline earth metal azide, to produce a 4-azido-3-hydroxybutyrate and hydrogenating an azide group of the ester compound and then cyclizing a hydrogenated compound. 4-Hydroxy-2-pyrrolidone is useful for an intermediate of medicines and agricultural chemicals.

L'invention concerne un procédé amélioré pour préparer la 4-hydroxy-2-pyrrolidone représentée par la formule (1), qui est utile comme intermédiaire pour synthétiser des médicaments, des composés utiles en agriculture, etc. Ce procédé consiste à synthétiser un ester de l'acide 4-azido-3-hydroxybutyrique par la réaction d'un ester d'un acide 4-halogéno-3-hydroxybutyrique avec un azoture de métal alcalin ou alcalino-terreux, suivie par la réduction catalytique du groupe azido de l'ester et cyclisation pour obtenir le composé (1).

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