A process for the preparation of optically pure R (−) salbutamol of formula (6) and its pharmaceutically acceptable salts by using a (+) 4-nitro tartranilic acid as the resolving agent and a binary solvent system comprising alkyl acetate and C
1
to C
4
branched or normal chain alcohol for dissolution of the racemic mixture and resolving agent and purification of the 4-nitro tartranilic acid salt of R (−) salbutamol. 4-nitro tartranilic acid salt of R (−) salbutamol is converted into formic acid salt of R(−) 4-benzyl salbutamol followed by basification and debenzylation to form optically pure R(−) salbutamol. Optically pure (R)-salbutamol is obtained in good yield and high purity. The optically pure R(−)salbutamol is optionally converted into pharmaceutically acceptable salts.
使用(+) 4-硝基
苯甲酸作为分离剂和二元溶剂体系,包括
醋酸烷基和C1到C4分支或正链醇溶解外消旋混合物和分离剂,并纯化R(−)
沙丁胺醇的4-
硝基苯甲酸盐,制备光学纯R(−)
沙丁胺醇及其药学可接受的盐。R(−)
沙丁胺醇的4-
硝基苯甲酸盐转化为R(−) 4-苄基
沙丁胺醇的
甲酸盐,随后碱化和除去苄基,形成光学纯R(−)
沙丁胺醇。光学纯R(−)
沙丁胺醇可选择转化为药学可接受的盐,得率高,纯度高。