PROCESS FOR THE PREPARATION OF IOPAMIDOL
    7.
    发明申请

    公开(公告)号:US20190077745A1

    公开(公告)日:2019-03-14

    申请号:US16052695

    申请日:2018-08-02

    摘要: 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 C1-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.

    COMPOSITION MADE OF AMINO ACID OR ESTER WITH POLYMER QUALITY AND METHODS FOR OBTAINING SAME

    公开(公告)号:US20180282259A1

    公开(公告)日:2018-10-04

    申请号:US15764596

    申请日:2016-09-28

    申请人: ARKEMA FRANCE

    摘要: The present invention relates to a composition which comprises at least one α,ω-amino-alkanoic acid or ester and at least one alkanoic ester or acid, characterised in that: the α,ω-amino-alkanoic acid or ester has formula H2N-(CH2)n—COOR, wherein n=9 to 13 and R is an alkyl group or a hydrogen; the alkanoic ester or acid has formula R1-COOR2, wherein R1 is a straight or branched alkyl group with formula CmH2m+1 or CmH2m−3, wherein m=6 to 20 and R2 is an alkyl group or a hydrogen; the molar ratio between the alkanoic acid(s) or ester(s) and the α,ω-amino-alkanoic acid(s) or ester(s) is in the range from 0.001 to 0.4%. The present invention also relates to novel methods for obtaining such a composition.