PROCESS FOR THE PREPARATION OF SILODOSIN AND ITS GAMMA FORM

摘要

The present invention provides an improved and efficient process for the preparation silodosin of formula I and pharmaceutically acceptable salts thereof Formula I. through novel tartrate salt of cyano hydroxy intermediate of formula II. Formula II The present invention also provides an improved, industrially advantageous and novel process for preparation of pure polymorphic form gamma (γ) of silodosin, wherein residual solvents are present in specified limits as per ICH guidelines. ·