申请人:Bracco Industria Chemica S.p.A.
公开号:US05066823A1
公开(公告)日:1991-11-19
A process for the preparation of 5-acylamino-2,4,6-triiodo or tribromo-benzoic acid derivatives of formula (I), wherein X is I or Br, R is H or a variously substituted alkyl, or a group of formula (II), wherein X has the above meanings; Y is hydroxy, alkoxy, hydroxyalkoxy, alkylamino or hydroxyalkylamino; Z may be the same as COY or it is hydroxylalkylaminocarbonyl provided that at least one of the two acyl or R groups is hydroxy-substituted, which process comprises the rearrangement of the corresponding 5-(alkylaminocarbonyl-alkoxy)-2,4,6-trioodo ro tribromo-benzoic acid derivatives, in the presence of bases.
一种制备式(I)的5-酰胺基-2,4,6-三碘或三溴苯甲酸衍生物的方法,其中X为I或Br,R为H或各种取代的烷基,或式(II)的基团,其中X具有上述含义;Y为羟基、烷氧基、羟基烷氧基、烷基氨基或羟基烷基氨基;Z可以与COY相同,或者是羟基烷基氨基羰基,前提是两个酰基或R基中至少有一个是羟基取代的,该方法包括在碱存在下重排相应的5-(烷氨基羰基-烷氧基)-2,4,6-三碘或三溴苯甲酸衍生物。