[EN] A PROCESS FOR THE PREPARATION OF {2-[4-( alpha -PHENYL-p-CHLOROBENZYL)PIPERAZIN-1-YL]ETHOXY}ACETIC ACID AND NOVEL INTERMEDIATES THEREFOR<br/>[FR] PROCEDE D'ELABORATION D'ACIDE ACETIQUE {2-[4-( DOLLAR G(A)PHENYL-P-CHLOROBENZYL)PIPERAZINE-1-YL]ETHOXY} ET INTERMEDIAIRES CORRESPONDANTS
申请人:EGYT GYOGYSZERVEGYESZETI GYAR
公开号:WO2001040211A1
公开(公告)日:2001-06-07
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。