申请人:BRACCO IMAGING S.P.A.
公开号:US20160237026A1
公开(公告)日:2016-08-18
The present invention discloses a process for the preparation of Iopamidol of formula (II) and comprising the following steps: a) reacting the Compound (I) wherein X is OR2 or R3, and wherein R2 and R3 are a Ci-C6 linear or branched alkyl, C3-C6 cycloalkyl, C6 aryl, optionally substituted with a group selected from the group consisting of methyl, ethyl, n-propyl, i-propyl, n-butyl, sec-butyl, t-butyl and phenyl, with the acylating agent (S)-2-(acetyloxy)propanoyl chloride in a reaction medium to provide the acetyloxy derivative of Compound (I); b) hydrolyzing the intermediate from step a) with an aqueous solution at a pH comprised from 0 to 7, by adding water or a diluted alkaline solution such as sodium hydroxide or potassium hydroxide, freeing the hydroxyls from the boron-containing protective groups, obtaining the N—(S)-2-(acetyloxy)propanoyl derivative of Compound (II); c) alkaline hydrolysis to restore the (S)-2-(hydroxy)propanoyl group and to obtain Iopamidol (II) and optional recovery of the boron derivative from the solution obtained in step b). The boron-containing protective group is versatile, efficient and recyclable. A one-pot synthesis, without intermediate isolation is provided, leading to a decreasing of recovered and recycled solvents and a significant increasing in the yield, representing a significant advantage in terms of cost-effectiveness of the entire process and environmental awareness.
本发明公开了一种制备II型碘普胺的方法,包括以下步骤:a)将化合物(I)与酰化试剂(S)-2-(乙酰氧)丙酰氯在反应介质中反应,其中X为OR2或R3,R2和R3为Ci-C6直链或支链烷基,C3-C6环烷基,C6芳基,可选地被甲基,乙基,正丙基,异丙基,正丁基,异丁基,叔丁基和苯基中的一种取代,以提供化合物(I)的乙酰氧衍生物;b)将步骤a)中间体与pH为0至7的水溶液水解,通过加水或稀释的碱性溶液,如氢氧化钠或氢氧化钾,释放含硼保护基的羟基,获得化合物(II)的N-(S)-2-(乙酰氧)丙酰衍生物;c)碱性水解以恢复(S)-2-(羟基)丙酰基团并获得碘普胺(II),并可从步骤b)所得溶液中回收硼衍生物。含硼保护基是多功能,高效和可回收的。提供了一种无中间体分离的一锅法合成,导致回收和再利用溶剂的减少以及收率的显着增加,代表了整个过程的成本效益和环境意识的显着优势。