A new compound, (S)-5-(2-acetoxypropanamido)-2,4,6-triiodoisophthalic acid, of formula II (S)-5-(2-acetoxypropanamido)-2,4,6-triiodoisophthalic acid. Said new compound is of use for the production of triiodinated contrast agent, especially lopamidol, with low content of acetyl and hydroxyacetyl analogs. The new compound may be formed from 5-amino-2,4,6-triiodoisophtalic acid by acylating with (S)-1-chloro-1-oxopropan-2-yl acetate. The new compound may then be converted to the respective acid dichloride by reacting with a chlorinating reagent, which is a further object of the present invention, followed by the amidation with 2-amino-1,3-propanediol and acetate hydrolysis.
一种新化合物,(S)-5-(2-乙酰氧基丙酰胺)-2,4,6-三
碘异苯二
甲酸,
化学式为II (S)-5-(2-乙酰氧基丙酰胺)-2,4,6-三
碘异苯二
甲酸。该新化合物用于生产三
碘对比剂,特别是洛帕米多,其乙酰和羟乙酰类似物含量低。该新化合物可以由5-
氨基-2,4,6-三
碘异苯二
甲酸通过与(S)-1-
氯-1-氧代
丙烷基
乙酸酯酰化而形成。然后,该新化合物可以通过与
氯化试剂反应转化为相应的酸二
氯化物,随后进行与2-
氨基-
1,3-丙二醇的酰胺化和
乙酸酯
水解。