申请人:Parthasaradhi Reddy Bandi
公开号:US20090149462A1
公开(公告)日:2009-06-11
The present invention relates to a process for obtaining pure aprepitant substantially free of undesired diastereomeric isomer, namely 5-[2(S)-[1(RS)-[3,5-bis(trifluoromethyl)-phenyl)ethoxy]-3-(S)-(4-fluorophenyl)-morpholin-4-yl-methyl]-3,4-dihydro-2H-1,2,4-triazol-3-one. The present invention further provides an improved process for preparation of aprepitant crystalline form II. The present invention also relates to novel amorphous form of aprepitant, a process for its preparation and to a pharmaceutical composition comprising it. The present invention further relates to aprepitant having a mean particle size of less than about 11.5 microns, a process for its preparation and to a pharmaceutical composition comprising it. Thus, for example, aprepitant having a content of diastereomeric impurity of 1.1% is dissolved in ethyl acetate at 70° C., the solution is concentrated to half the initial volume by distilling off ethyl acetate, and the resulting solid is collected at 0-5° C. to give pure aprepitant substantially free of its diastereomeric impurity.
本发明涉及一种几乎不含不需要的立体异构体,即5-[2(S)-[1(RS)-[3,5-双(三氟甲基)苯基)乙氧基]-3-(S)-(4-氟苯基)吗啉-4-基甲基]-3,4-二氢-2H-1,2,4-三唑-3-酮的纯阿瑞吡坦的制备工艺。本发明进一步提供了一种改进的制备阿瑞吡坦II型结晶形式的方法。本发明还涉及一种新的阿瑞吡坦无定形形式、其制备方法以及包含该无定形形式的药物组合物。本发明还涉及平均粒径小于约11.5微米的阿瑞吡坦、其制备方法以及包含它的药物组合物。因此,例如,含有1.1%立体异构体杂质的阿瑞吡坦在70°C下溶于乙酸乙酯中,通过蒸馏掉乙酸乙酯将溶液浓缩到初始体积的一半,然后在0-5°C下收集所得固体,以得到几乎不含其立体异构体杂质的纯阿瑞吡坦。