A process for preparation of substantially pure polymorphic Form I of olazapine consists in that olanzapine starting material is subjected to: a) at least one digestion step in an acidic aqueous medium, with an optional addition of active charcoal, and then to neutralizing to pH within the range from about 6.0 to about 11.0, and b) at least one step of separation of impurities in a water—organic solvent system, followed by crystallization from the solution in methylene chloride, and wherein steps a) and b) are separated by steps of isolation of precipitate of olanzapine and can be accomplished in any order.
制备olazapine的基本纯形态I的过程包括以下步骤:将olanzapine原料置于酸性
水介质中至少进行一次消化步骤,可选择添加
活性炭,然后将pH值中和至约6.0至约11.0之间,以及在
水有机溶剂体系中至少进行一次杂质分离步骤,随后在
氯仿中结晶,其中步骤a)和b)由olanzapine的沉淀隔开,可以按任意顺序完成。