[EN] A PROCESS FOR THE MANUFACTURING OF LORATADINE AND ITS INTERMEDIATES<br/>[FR] PROCEDE DE PRODUCTION DE LORATADINE ET SES INTERMEDIAIRES
申请人:MOREPEN LAB LTD
公开号:WO2006006184A2
公开(公告)日:2006-01-19
The process comprises (i) subjecting substituted benzyl halide to cyanation in a biphasic system using water immiscible solvents by any known methods, (ii) condensing in situ the phenyl acetonitrile thus obtained with nicotinic ester in presence of alkali metal alkoxide and water immiscible organic solvent to produce ketonitrile, (iii) hydrolyzing followed by decarboxylating the said ketonitrile in situ to respective ketone in acid environment below 60° C, (iv) subjecting the ketone so obtained to reduction followed by N-oxidation, cyanation, and hydrolysis by any known methods to produce picolinic acid, (v) cyclising the said picolinic acid to tricyclic ketone by conventional methods, (vi) treating the said tricyclic ketone with organometallic compound containing Mg to produce carbinol, (viii) purifying the said carbinol with purifying agent selected from polar water miscible organic solvent followed by dehydrating with neat sulphuric acid at the temperature below 50° C, to get N-methyl product (olefin), and subjecting the said olefin to N-carbethoxylation to produce loratadine. Loratadine can also be prepared by treating cayano compound with organometallic compound containing Mg to produce a ketone by the methods known in the art followed by cyclising in presence of a mixture of sulfuric acid and a source of boric acid to get N-methyl product and converting to loratadine by N-carbethoxylation.
该过程包括以下步骤:(i)使用不溶于水的溶剂,通过任何已知的方法在两相体系中将取代苄基卤化物进行氰化;(ii)在碱金属烷氧化物和不溶于水的有机溶剂的存在下,原位缩合得到的苯基乙腈与烟酸酯,以产生酮腈;(iii)在60℃以下的酸性环境中,水解后脱羧化原位处理所述的酮腈,得到相应的酮;(iv)通过任何已知的方法,对所得的酮进行还原、N-氧化、氰化和水解,以产生吡啶甲酸;(v)通过传统方法,将所述吡啶甲酸环化为三环酮;(vi)使用含有镁的有机金属化合物处理所述的三环酮,以产生碳醇;(vii)使用从极性水溶性有机溶剂中选择的纯化剂,然后在低于50℃的温度下使用浓硫酸脱水,以获得N-甲基产物(烯烃);(viii)将所述烯烃进行N-羧乙氧化反应,以产生氯雷他定。氯雷他定也可以通过将氰化合物与含有镁的有机金属化合物处理,以产生酮,然后在硫酸和硼酸源的混合物存在下环化,得到N-甲基产物,通过N-羧乙氧化反应转化为氯雷他定。