申请人:DAIICHI PHARMACEUTICAL CO., LTD.
公开号:US20010034446A1
公开(公告)日:2001-10-25
Disclosed are a process for the preparation of a compound represented by the formula (1), which comprises treating a compound represented by the formula (2) with methanesulfonic acid and then subjecting the thus-treated compound to recrystallization; and Compound (1) so obtained.
1
This Compound (1) is free of hygroscopicity, excellent in filterability and solubility and easy in handling. Furthermore, according to the preparation process of the present invention, an unnecessary isomer can be converted into the target one and separation of the target isomer can be conducted easily.
本发明揭示了一种制备式(1)所代表的化合物的方法,包括用甲磺酸处理式(2)所代表的化合物,然后将经处理的化合物进行重结晶;以及获得的式(1)化合物。该化合物(1)具有非吸湿性,过滤性和溶解性优良,易于处理。此外,根据本发明的制备方法,不必要的异构体可以转化为目标异构体,并且可以轻松地分离目标异构体。