Process for Preparing Chiral 3-Triazolyl Sulphoxide Derivatives

Process for preparing 3-triazolyl sulphoxide derivatives of the formula (I) in an enantiomerically pure or enantiomerically enriched form

• in which
• X1 and X2 are each independently fluorine, chlorine, bromine, hydrogen, (C1-C12)alkyl, (C1-C1)haloalkyl,
• Y1 and Y2 are each independently fluorine, chlorine, bromine, hydrogen, (C1-C12)alkyl, (C1-C12)haloalkyl,
• R1 and R2 are each independently hydrogen, (C1-C12)alkyl, (C1-C12)haloalkyl, cyano, halogen, nitro,
• R3 is hydrogen, (C1-C12)alkyl, amino, nitro, NH(CO)(C1-C12)alkyl, N═CR′R
• where R, R′ are each independently hydrogen, (C1-C12)alkyl, aryl,
• characterized in that
• (A) a sulphide of the formula (II)
• in which X1, X2, Y1, Y2, R1, R2 and R3 are each as defined above
• is converted in the presence of a chiral catalyst and of an oxidizing agent.