Synthesis
A preparation method for pharmaceutical intermediate cis-2-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-ylmethyl methanesulphonate. The method comprises the following steps: (1) at first is raw material with the Meta Dichlorobenzene, carries out friedel-crafts reaction with bromoacetyl bromide; (2) then at heteropolyacid TiSiW 12O 40/ SiO 2Following and the glycerine condensation of catalysis; (3) with the Benzoyl chloride 99min. esterification; (4) under the catalysis of yellow soda ash, it is condensed with 1,2,4-triazole, then hydrolysed and recrystallised to yield cis-alcohol; (5) obtain product with the methylsulfonyl chloride esterification.Reaction equation is following: