A new process for preparing pure amorphous rosuvastatin calcium, substantially free of impurities, is disclosed. A process comprising hydrolysing a C
1
to C
5
alkyl ester of rosuvastatin, preferably methyl rosuvastatin or tert-butyl rosuvastatin, with a base, e.g. sodium hydroxide, in the presence of an aprotic solvent, preferably tetrahydrofuran and N,N-dimethyl acetamide, or in the presence of a mixture of an aprotic solvent and water, to obtain a solution of rosuvastatin salt, which may be converted to another rosuvastatin salt using another cation, e.g. with calcium cation to obtain rosuvastatin calcium. Rosuvastatin amine salts may be obtained as well.
In another preferred aspect of the invention rosuvastatin free acid may be converted to various rosuvastatin salts, e.g. to rosuvastain calcium, rosuvastatin sodium or various rosuvastatin amine salts, including rosuvastatin solvates, e.g. rosuvastatin calcium hydrate.
Rosuvastatin calcium is useful in the treatment of hyperlipidemia, hypercholesterolemia and atherosclerosis.
本发明公开了一种制备纯无定形罗舒伐他汀
钙的新工艺,基本上不含杂质。该工艺包括在无极溶剂(如
四氢呋喃和N,N-二甲基乙酰胺)或无极溶剂和
水混合物中,用碱(如
氢氧化钠)
水解罗舒伐他汀的C1至C5烷基酯,首选甲基罗舒伐他汀或叔丁基罗舒伐他汀,以获得罗舒伐他汀盐溶液,该溶液可用另一种阳离子(如
钙离子)转化为另一种罗舒伐他汀盐,例如罗舒伐他汀
钙。还可以获得罗舒伐他汀胺盐。在发明的另一个首选方面中,罗舒伐他汀
游离酸可以转化为各种罗舒伐他汀盐,例如罗舒伐他汀
钙、罗舒伐他汀
钠或各种罗舒伐他汀胺盐,包括罗舒伐他汀溶剂合物,例如罗舒伐他汀
钙水合物。罗舒伐他汀
钙对治疗高脂血症、高
胆固醇血症和动脉粥样硬化有用。