Process for the preparation of optically active azole...

Details Process for the preparation of optically active azole... Process for the preparation of optically active azole...

C - Chemistry, Metallurgy

07

D

260/313, 260/315

C07D 233/60 (2006.01) C07D 249/08 (2006.01) C07D 521/00 (2006.01)

Patent

CA 1273941

Process for the preparation of optically active azole derivatives ABSTRACT A new process for the preparation of optically active azole derivatives of the formula Image (I) in which R1, R2, R3 and X have the meanings which are metioned in the specicication, which process comprises reacting, in a first stage, a racemate of an azole derivative of the formula Image (Ia) with an optically active permethric acid halide of the formula Image (II) and then, in a second stage, separating the diastereomeric esters thus obtained, of the formula Image (III) (diastereomer mixture) on the basis of their different physical proper- ties, and, thereafter, in a third stage, liberating the particular azole derivative of the formula (I) from the corresponding ester with the aid of a base.

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