The present invention relates to new salts (II) of Montelukast (I) and process for preparing these salts where B is ammonia, benzylamine or phenyl hydrazine. The invention also provides a process for preparation amine salts comprising (a) dissolving/ suspending the Montelukast free acid of formula (I) in an organic solvent (b) reacting with an amine (c) isolating the amine salt of formula (II) by adding optionally another anti-solvent, and (d) optionally drying the isolated solid under vacuum. The invention provides a process for preparation of sodium salt of montelukast acid comprising lowering pH of aqueous solution of amine salt of montelukast having formula II to 5.0±0.5, raising pH to above 8.0 using source of sodium ion, and isolating, the sodium salt by crystallization.
本发明涉及蒙特卢卡斯特的新盐(II)及制备这些盐的方法,其中B是
氨、
苄胺或苯
肼。本发明还提供了一种制备胺盐的方法,包括(a)将式(I)的蒙特卢卡斯特自由酸溶解/悬浮在有机溶剂中(b)与胺反应(c)通过加入可选的另一种抗溶剂分离出式(II)的胺盐,以及(d)可选地在真空下干燥分离出的固体。本发明提供了一种制备蒙特卢卡斯特酸钠盐的方法,包括将式II的蒙特卢卡斯特胺盐的
水溶液pH降至5.0±0.5,使用
钠离子源将pH升至8.0以上,并通过结晶分离出钠盐。