申请人:Dibra S.p.A.
公开号:US05965772A1
公开(公告)日:1999-10-12
A process for the preparation of 5-[acetyl(2,3-dihydroxypropyl)amino]-N,N'-bis(2,3-dihydroxypropyl)-2,4,6-t riiodo-1,3-benzenedicarboxamide of formula (I), starting from 5-amino-1,3-benzenedicarboxylic acid of formula (II), comprising the following steps: step a) is the reaction in heterogeneous phase between 5-amino-2,4,6-triiodo-1,3-benzenedicarboxylic acid and thionyl chloride in a solvent selected from the group consisting of: straight or branched (C.sub.7 -C.sub.16) hydrocarbons, (C.sub.7 -C.sub.8) aromatic hydrocarbons, 1,1,1-trichloroethane, n-butyl acetate, diglyme (diethylene glycol dimethyl ether), in the presence of catalytic amounts of a tertiary amine, to give compound (III); step b) is the acetylation reaction of compound (III) with glacial acetic acid both as the solvent and the reagent and thionyl chloride; step c) is the formation of compound (V) by reaction of the compound (IV) with 1-amino-2,3-propanediol, by reaction of compound (IV) in a dipolar aprotic solvent, selected from the group of dimethylformamide (DMF), dimethylacetamide (DMA), dimethylsulfoxide (DMSO) or N-methyl-pyrrolidinone; step d) is the alkylation of the compound (V) in aqueous solution at basic pH, by addition of a sodium hydroxide-calcium hydroxide mixture, with 3-chloro-1,2-propanediol or epichlorohydrin, at a temperature of 40-90.degree. C.
从式(I)的5-[乙酰(2,3-二羟基丙基)
氨基]-N,N'-双(2,3-二羟基丙基)-2,4,6-三
碘-1,3-苯二甲酰胺的制备方法,起始物为式(II)的5-
氨基-1,3-苯二
甲酸,包括以下步骤:步骤a)是在异相反应中,将5-
氨基-2,4,6-三
碘-1,3-苯二
甲酸和
氯化亚砜在所选溶剂中发生反应,所选溶剂来自以下组合:直链或支链(C.sub.7 -C.sub.16)烃类、(C.sub.7 -C.sub.8)
芳香烃、
1,1,1-三氯乙烷、
醋酸正丁酯、二甘醚(
二乙二醇二甲醚),在三级胺的催化下,得到化合物(III);步骤b)是用
冰醋酸作为溶剂和试剂以及
氯化亚砜对化合物(III)进行乙酰化反应;步骤c)是通过在二极性无
水溶剂中,选择自二甲基甲酰胺(
DMF)、二甲基乙酰胺(
DMA)、
二甲基亚砜(
DMSO)或
N-甲基吡咯烷酮的组合中,将化合物(IV)与1-
氨基-2,3-
丙二醇反应,形成化合物(V);步骤d)是在碱性pH值的
水溶液中,通过加入
氢氧化钠-
氢氧化钙混合物,将化合物(V)烷基化,使用
3-氯-1,2-丙二醇或
环氧氯丙烷,在40-90摄氏度的温度下进行。