Preparation method for intermediate compound acting as synthetic posaconazole, and intermediate compound prepared thereby

A method for preparing a compound of Formula IX as a key intermediate for posaconazole from a compound of Formula II, comprising the following step (1) and steps (6) to (8):

• step (1):
• hydrolyzing a compound of Formula II in a mixed solvent of an organic solvent and water under an alkaline condition, and then subjecting the hydrolysate to an acid treatment to obtain the compound of Formula I;
• step (6):
• reducing the compound of Formula I in an organic solvent in the presence of a reducing agent at a temperature in a range of −5˜5° C. to obtain a compound of Formula VII;
• step (7):
• reacting the compound of Formula VII with 1,2,4-triazole in an organic solvent in the presence of a base and a phase transfer catalyst to obtain a compound of Formula VIII;
• and
• step (8):
• reacting the compound of Formula VIII with p-toluenesulfonyl chloride in an organic solvent under an alkaline condition to obtain the compound of Formula IX,
• wherein X is Cl, Br or I;
• R1 is an ester protection group;
• and Ts represents p-toluenesulfonyl.