An Efficient, Novel Synthetic Route to (R)-Salmeterol Xinafoate and Facile
Synthetic Protocols for Preparation of its Process Related Potential Impurities
[EN] METHOD OF PREPARING INTERMEDIATE OF SALMETEROL<br/>[FR] PROCÉDÉ DE PRÉPARATION D'INTERMÉDIAIRE DE SALMÉTÉROL
申请人:AMPHASTAR PHARMACEUTICALS INC
公开号:WO2016054279A1
公开(公告)日:2016-04-07
A method of preparing an intermediate of salmeterol (Compound 1, 2-amino-1-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl) ethanol) includes: reacting compound 2 with 2-methoxypropene in a first organic solvent to produce a reaction solution including compound 3, compound 2 including a 2-bromo precursor of Compound 1; reacting compound 3 with a nitrogen source to produce compound 4; reacting compound 4 with sodium borohydride in a second organic solvent to produce compound 5; and debenzylating compound 5 by ammonium formate / palladium-carbon catalytic transfer hydrogenation in a third organic solvent to produce Compound 1. A method of preparing salmeterol includes preparing Compound 1, and reacting Compound 1 to prepare salmeterol.
Process and intermediates for the preparation of Salmeterol
申请人:Generics [UK] Limited
公开号:EP1937626B1
公开(公告)日:2016-02-17
METHOD OF PREPARING INTERMEDIATE OF SALMETEROL
申请人:AMPHASTAR NANJING PHARMACEUTICALS, INC.
公开号:EP3201171B1
公开(公告)日:2020-04-15
NOVEL PROCESS
申请人:Gore Vinayak G.
公开号:US20080262267A1
公开(公告)日:2008-10-23
The present invention relates to processes for the preparation of 4-hydroxy-α′-[[[6-(4-phenylbutoxy)hexyl]amino]methyl]-1,3-benzenedimethanol 1-hydroxy-2-naphthoate (salmeterol xinafoate) (12a), the preparation of 4-hydroxy-α′-[[[6-(4-phenylbutoxy)hexyl]amino]methyl]-1,3-benzenedimethanol (salmeterol) (11), the preparation of protected N-[6-(4-phenylbutoxy)hexyl]amine intermediates (7), and the preparation of 6-substituted (4-phenylbutoxy)hexane intermediates (5), shown below, wherein X is a leaving group and Pg is a protecting group.