SILODOSIN INTERMEDIATE AND PREPARATION METHOD THEREFOR

摘要

Disclosed are a silodosin intermediate and a preparation method thereof. The silodosin intermediate has the structure shown by the formula (A). X is hydrogen or bromide and R 1 is hydrogen. The formyl group may be a group having the structure shown by the formula I. R 7 is an carboxyl-protecting group, and R 2 is 3-hydroxypropyl or a group having the structure shown by the formula II. W is a hydroxyl-protecting group. A compound of the formula (A) according to the present invention may further be used for preparing a compound having the structure shown by the formula (D). By means of the intermediate and the preparation method therefor provided by the present invention, high-purity optically pure silodosin can be obtained, and the optical purity is above 99%.