The present invention relates to a novel and commercially viable process for substantially optically pure levorotatory and dextrorotatory enantiomers of cetirizine intermediate, 1-[(4-chlorophenyl)phenylmethyl]piperazine, thereby producing substantially optically pure levorotatory and dextrorotatory enantiomers of cetirizine and their pharmaceutical acceptable acid addition salts thereof in high purity and in high yield using novel intermediates.
本发明涉及一种新颖且商业可行的过程,用于生产左旋和右旋异构体的赛曲唑中间体1-[(4-
氯苯基)苯甲基]
哌嗪,从而高纯度高产率地生产赛曲唑的左旋和右旋异构体及其药用可接受的酸盐。