摘要:
The present invention relates to a process for the preparation of given carboxamido compounds, in particular of 2,4,6-triiodoisophthalic acid derivatives, as useful intermediates for the preparation of X-ray contrast media among which is iopamidol. The said process comprises reacting suitable N-sulfinyl intermediate compounds with a commercially available α-hydroxyacid or a salt thereof.
摘要:
The present invention relates to a method for the acetylation of an aqueous solution of lactic acid to (S)-2-acetyloxypropionic acid. The process comprises in particular removing water from the solution of lactic acid and reacting lactic acid with acetic anhydride in the presence of acetic acid.
摘要:
The present invention relates to a process for the preparation of iodinated anilines; in particular, it relates to a process including the direct iodination, with suitably activated iodine, of 3,5-disubstituted anilines to the corresponding 3,5- disubstituted-2,4,6-triiodoanilines, which are useful intermediates for the synthesis of x-ray contrast media, and to the preparation of the contrast media themselves.
摘要:
The present invention relates to a process for the preparation of a solid form of the gadobenate dimeglumine compound that essentially comprises obtaining a solution of the said compound in a suitable solvent A and adding, under stirring and appropriate temperature conditions, the said obtained solution in a suitable organic solvent B, acting as an appropriate antisolvent and favoring the formation and precipitation of solid particles of the complex compound that can be easily collected by filtration in high yields and in a reliable way.
摘要:
The present invention relates to a process for the preparation of a solid form of the gadobenate dimeglumine compound that essentially comprises obtaining a solution of the said compound in a suitable solvent A and adding, under stirring and appropriate temperature conditions, the said obtained solution in a suitable organic solvent B, acting as an appropriate antisolvent and favoring the formation and precipitation of solid particles of the complex compound that can be easily collected by filtration in high yields and in a reliable way.