Method of preparing enantiomerically-pure...

Details Method of preparing enantiomerically-pure... Method of preparing enantiomerically-pure...

C - Chemistry, Metallurgy

07

D

C07D 413/04 (2006.01) C07D 207/09 (2006.01)

Patent

CA 2167833

A novel process for preparing enantiomerically -pure 3-methyl-5-(1-(C1-C3-alkyl)-2-pyrrolidyl)isoxazole in high yield, wherein a protected pyrrolidine or 2-oxo-pyrrolidine starting material is reacted with a suitable organic anion and a resulting beta-keto oxime intermediate is cyclized and dehydrated, as well as intermediates useful in the preparation thereof.

Nouveau procédé de préparation de 3-méthyl-5-(1-(alkyl-C1-C3)-2-pyrrolidinyl) isoxazoles en grande quantité, dans lequel on fait réagir une matière de départ protégée à base de pyrrolidine ou de 2-oxo-pyrrolidine avec un anion organique approprié, puis on cyclise et on déshydrate un intermédiaire à base de béta-céto oxime résultant, ainsi que des intermédiaires utiles dans ladite préparation.

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