Patent ID: 8394935

Claim:
A method for producing a compound represented by the following formula (4): wherein each of X 1 and X 2 represents a protecting group of a hydroxyl group, which may be the same or different, Y represents CH 2 OX 3 or CH 3 ; X 3 represents a protecting group of a hydroxyl group; and Z represents an acyl group, which comprises allowing an acylating agent to react with a compound represented by the following formula (3) in the presence of acid: wherein each of X 1 and X 2 represents a protecting group of a hydroxyl group, which may be the same or different; Y represents CH 2 OX 3 or CH 3 ; X 3 represents a protecting group of a hydroxyl group; and R represents a lower alkyl group, wherein 6 equivalents or less of the acylating agent, with respect to the amount of the compound of formula (3) used, is allowed to react with the compound of the formula (3), and/or the acylating agent is allowed to react with the compound of the formula (3) in the presence of a poor solvent, so that the produced compound represented by formula (4) whose configuration at 1-position is β (β-anomer) is precipitated.