The present invention relates to an improved process for the preparation of Darifenacin hydrobromide of Formula (I). (i) condensing 3-(S)-(-)-1l-carbamoyl-1,1-diphenylmethyl)pyrrolidine (III), or its salt, with a compound of Formula XIII in the presence of a. base in a solvent, wherein X represents Cl, Br, C1-3 alkyl sulfonate or C6-10 arγl sulfonate; to produce (S)-2-[1-[2-(2,3-dihydrobenzofuran-5-yl)ethyl]-3- pyrrolidinyl]-2,2-diphenylacetamide (Darifenacin) (Ia), (ix) treating (S)-2-[1-[2-(2,3-dihydrobenzofuran-5-yl)ethyl]-3-pyrrolidinyl]- 2,2-diphenylacetamide (Darifenacin) (Ia) with an acid in a solvent and water mixture, (x) isolating pure (S)-2-[1-[2-(2,3-dihydrobenzofuran-5-yl)ethyl]-3- pyrrolidinyl]-2,2-diphenylacetamide (Darifenacin) (Ia), (xi) treating pure Darifenacin (Ia) with HBr to produce Darifenacin hydrobromide (I).
本发明涉及一种改进的制备Darifenacin hydrobromide(I)的过程。 (i) 在溶剂中,将3-(S)-(-)-1l-
氨基-1,
1-二苯甲基吡咯烷(III)或其盐与化合物XIII的化合物在碱的存在下缩合,其中X代表Cl、Br、C1-3烷基
磺酸盐或C6-10芳基
磺酸盐;以产生(S)-2-[1-[2-(
2,3-二氢苯并呋喃-5-基)乙基]-3-
吡咯基]-2,2-二苯乙酰胺(Darifenacin)(Ia),(ix) 在溶剂和
水混合物中用酸处理(S)-2-[1-[2-(
2,3-二氢苯并呋喃-5-基)乙基]-3-
吡咯基]-2,2-二苯乙酰胺(Darifenacin)(Ia),(x) 分离纯净的(S)-2-[1-[2-(
2,3-二氢苯并呋喃-5-基)乙基]-3-
吡咯基]-2,2-二苯乙酰胺(Darifenacin)(Ia),(xi) 用HBr处理纯净的Darifenacin(Ia)以产生Darifenacin hydrobromide(I)。