The invention refers to a novel process for the preparation of cetirizine of formula (I) as well as to novel 2-[4-(α-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}acetamides of formula II, wherein R1 and R2 represent, independently, a C1-4 alkyl group optionally substituted by a phenyl group, a C2-4 alkenyl group or a cyclohexyl group, or R1 and R2 form together with the adjacent nitrogen atom a morpholino group. According to the novel process, an acetamide of formula (II) is hydrolized, if desired in the presence of a phase transfer catalyst, to obtain cetirizine.
本发明涉及一种新型的制备式(I)的右替拉定的方法,以及新型的式(II)的2-[4-(α-苯基-p-
氯苯基)
哌嗪-1-基]乙氧基}乙酰胺,其中R1和R2独立地表示C1-4烷基,可选择地被苯基,C2-4烯基或环己基取代,或R1和R2与相邻的氮原子一起形成
吗啡环基。根据这种新的方法,式(II)的乙酰胺可以在需要的情况下在相转移催化剂的存在下
水解,以获得右替拉定。