申请人:Zambon Group S.p.A.
公开号:US05580993A1
公开(公告)日:1996-12-03
A process for the preparation of Iopamidol and 5-amino-2,2-dialkyl-1,3-dioxanes of formula ##STR1## wherein R and R.sub.1 are the same or different and represent a straight or branched C.sub.1 and C.sub.2 alkyl group or together with the carbon atom to which they are bonded, form a C.sub.5 -C.sub.6 cycloaliphatic ring; comprising the transformation of a 2,2-dialkyl-1,3-dioxane-5-carboxylic acid ester of formula ##STR2## wherein R.sub.2 represents a straight or branched C.sub.1 -C.sub.2 alkyl group, a phenyl optionally substituted by nitro groups or a benzyl; by treatment with ammonia into the corresponding amides and the subsequent rearrangement of the latter into the compounds of formula I, by treatment with a hypohalogenite. The resultant ketals may be used as is, or be converted to 2-amino-1,3-propanediol, and reacted with 5-amino-2,4,6-triiodo-isophthalic acid dichloride or, alternatively,L-5-(2-acetoxy-propionylamino)-2,4,6-triido-isophthalic acid dichloride, to produce Iopamidol.
一种制备Iopamidol和式为##STR1##的5-氨基-2,2-二烷基-1,3-二噁烷的方法,其中R和R.sub.1相同或不同,表示直链或支链C.sub.1和C.sub.2烷基或与它们连接的碳原子形成C.sub.5-C.sub.6环状脂肪族环;包括将式为##STR2##的2,2-二烷基-1,3-二噁烷-5-羧酸酯经过氨处理成相应的酰胺,然后通过次氯酸盐处理将后者重排成式I的化合物。所得的缩醛可以直接使用,也可以转化为2-氨基-1,3-丙二醇,并与5-氨基-2,4,6-三碘异苯甲酸二氯化物或L-5-(2-乙酰氧基-丙酰胺基)-2,4,6-三碘异苯甲酸二氯化物反应,制备Iopamidol。