36 results about "Iopamidol" patented technology

The present invention discloses a process for the preparation of pure non-ionic contrast agents. The invention also includes a method for purifying the non-ionic contrast agents.

The present invention relies on a process for the preparation of non ionic iodinated contrast agents and, in more details, it relates to a process for the preparation of Iopamidol in high yields and with a high degree of purity. In more details, the invention discloses a process for the preparation of a compound of formula (III) comprising the 5 condensation reaction a compound of formula (II) with 2-amino-1,3-propandiol, being said reaction carried out in an aprotic dipolar solvent and in the presence of an alkaline or alkaline rare earth metal oxide or hydroxide.

The invention relates to a method for removing iopamidol in water by an ultraviolet / chlorine combined process. The method comprises the following specific steps: (1) pretreating a to-be-treated water sample; (2) adding a solution which contains or can produce free chlorine to the pretreated water sample in step (1), adjusting the pH value, and carrying out an ultraviolet catalytic oxidation reaction to remove the iopamido in the water. Compared with the prior art, according to the method, the pH value of a reaction water body is appropriately adjusted by an ultraviolet / chlorine combined technological process, so that the content of the iopamidol in a water body can be rapidly reduced, and the removal effect can reach 99% or above; the operation is simple; the reaction conditions are easy to control; engineering application is easy to realize; in addition, chemical reagents and materials used are both conventional products for water treatment; no other toxic and harmful substances are introduced; the safety is particularly prominent; the reaction environment is easy to realize; treatment can be carried out under room temperature conditions; the feasibility and operability of the method are effectively improved.

The present invention relates to a preparation method of serinol, belonging to the field of serinol preparation technology by using reduction reaction. Said serinol is an important intermediate body for preparing nonionic X-ray contrast agent iopamidol. Said invention uses 2-nitro-1,3-propanediol sodium salt as raw material, uses hydrazine hydrate as reducing agent and uses palladium / carbon as catalyst to prepare serinol at normal pressure.

The present invention discloses a bismuth selenide nanometer material, a preparation method and applications thereof. The preparation method comprises: dissolving a bismuth salt, a selenium-containing compound and a stabilizer in a solvent, carrying out an ultrasonic treatment, uniformly mixing, heating to a temperature of 80-200 DEG C, adding a reducing agent, cooling to a room temperature after completing a reaction, and carrying out centrifugation separation washing three times to obtain the bismuth selenide nanometer material with a diameter of 20-200 nm. The preparation method has characteristics of simple operation, less time consuming, low energy consumption and easy scalization. The prepared particles have a uniform particle size and good dispersity. With application of the bismuth selenide nanometer material as a living body X-ray CT imaging contrast agent, a significant imaging effect is provided compared with imaging effects of the traditional contrast agents such as an iodine reagent iopamidol and the like so as to provide important application prospects in the future tumor imaging field.

The present invention generally relates to a process using a mechanochemical approach exploiting the mechanical milling of reactants for the manufacturing of acetyl Iopamidol and, more generally, of key intermediates of radiographic contrast agents, and of the contrast agents themselves.

The invention discloses a contrast medium based on an iopamidol lipid derivative, as well as a preparation method and application of the contrast medium. The lipid molecule structure comprises both hydrophobic aliphatic chains and hydrophilic iopamidol groups which can be combined to form nanoparticle structures by selves in a water solution, and in addition, as the aliphatic chains and the iopamidol can be connected through degradable ester bonds, the biocompatibility of the contrast medium can be further improved; moreover, as covalent bonds in the molecule structures of such substances are connected with iopamidol functional groups, the content of iopamidol in nanoparticles can be increased, and meanwhile the problems that the contrast medium is released and leaked too early in the particle circulation process can be effectively avoided. The nanoparticles formed by lipid of the contrast medium can be used as a functional material which is used as a contrast medium and a carrier of various medicines and other contrast mediums, thereby having wide clinical application prospects.

The invention relates to preparation and application of a nanometer contrast agent for tumor targeted CT imaging. The nanometer contrast agent having a tumor targeted CT imaging function is prepared by the following steps: firstly, designing and synthesizing an iodine-containing functional monomer compound which can be applied to polymerization based on a clinically-used small molecular CT contrast agent, namely, iopamidol; then, preparing iodine-containing polymer nanoparticles with appropriate particle sizes by precipitation polymerization, and performing polyethylene glycol and RGD peptidesurface modification on the iodine-containing polymer nanoparticles. The prepared iodine-containing nanoparticles can be used as a contrast agent for tumor CT imaging, so that a reliable theoretical basis and a method basis are laid for highly-sensitive diagnosis of tumors.

The invention discloses a improved process for the preparation of 3,5-disubstituted-2,4,6-triiodo aromatic amines of formula (II), wherein R1 and R2 are defined as herein. The compounds of formula (II) are the key intermediates for the synthesis of a series of non-ionic contrast agents such as Iopamidol, Iohexol and Iodixanol. The process comprises reacting chlorine-free iodinating reagents with 3,5-disubstituted-2,4,6-triiodo aromatic amines to obtain 3,5-disubstituted-2,4,6-triiodo aromatic amines of formula (II), wherein the molar yield of the iodination reaction can reach to 89%.

The present invention relates to a continuous method for the preparation of (S)-2-acetyloxypropionic acid from an aqueous solution of lactic acid and acetic anhydride, in acetic acid. (S)-2-acetyloxypropionic acid is used for the preparation of (S)-2-acetyloxypropionic acid chloride, an essential intermediate compound for the preparation of Iopamidol and has to be industrially produced with high purity and suitable quality for producing Iopamidol according to the Pharmacopoeia requirements. The continuous process according to the invention, comprises therefore also the chlorination steps of (S)-2-acetyloxypropionic acid with thionyl chloride to give the corresponding (S)-2-acetyloxypropionic acid chloride which is further distilled to give the suitable purity characteristics for its use for the preparation of non-ionic iodinated contrast agents as Iopamidol.

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 Ci-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.

A process for the preparation of (S)-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxo-propyl)amino]-2,4,6-triiodo-1,3-benzendicarboxamide (iopamidol) starting from 5-amino-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide (II) which process comprises a) reacting the compound of formula (II) with a suitable protecting agent, to give a compound of formula (III) wherein R is a group of formula A or B wherein R1 is a hydrogen atom, a C1÷C4 straight or branched alkoxy group, R2 is hydrogen, a C1÷C4 straight or branched alkoxy group and R3 ?is a C1÷C4 straight or branched alkyl group, a trifuoromethyl or a trichloromethyl group; b) acylating the amino group in position 5 of the intermediate compound of formula (III), by reaction with a (S)-2-(acetyloxy)propanoyl chloride to give a compound of formula (IV) wherein R is as defined above; and c) removing all the acyl groups present in the compound of formula (IV) under basic conditions, with prior cleavage of the cyclic protections of the hydroxy groups in the carboxamido substituents under acidic conditions, when R is a group of formula A carboxamido hydroxy groups under acidic conditions. The invention also refers to the new intermediates of formula (III) and (IV) wherein —R is a group A.

A process for the preparation of (S)-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxo-propyl)amino]-2,4,6-triiodo-1,3-benzendicarboxamide (iopamidol) starting from 5-amino-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide (II) which process comprises a) reacting the compound of formula (II) with a suitable protecting agent, to give a compound of formula (III) wherein R is a group of formula A or B wherein R1 is a hydrogen atom, a C1÷C4 straight or branched alkoxy group, R2 is hydrogen, a C1÷C4 straight or branched alkoxy group and R3 ?is a C1÷C4 straight or branched alkyl group, a trifuoromethyl or a trichloromethyl group; b) acylating the amino group in position 5 of the intermediate compound of formula (III), by reaction with a (S)-2-(acetyloxy)propanoyl chloride to give a compound of formula (IV) wherein R is as defined above; and c) removing all the acyl groups present in the compound of formula (IV) under basic conditions, with prior cleavage of the cyclic protections of the hydroxy groups in the carboxamido substituents under acidic conditions, when R is a group of formula A carboxamido hydroxy groups under acidic conditions. The invention also refers to the new intermediates of formula (III) and (IV) wherein —R is a group A.

The invention provides an exosome purification method. The exosome purification method comprises the following steps: (1) centrifuging a cell culture solution rich in exosomes; (2) centrifuging supernate obtained in the step (1) and a 40% (w / v) iopamidol solution together to obtain an exosome crude extract, wherein the volume ratio of the supernate obtained in the step (1) to iopamidol is (500-600):1; (3) diluting the exosome crude extract by 4-6 times with a buffer solution, and performing centrifuging together with the exosomes, wherein the exosomes are located at the lower part of the exosome crude extract; the volume ratio of the exosome crude extract to the exosome is 2:(1-1.5); and the exosome is a 25-30% (w / v) iopamidol solution; and (4) respectively collecting products obtained after centrifugal layering in the step (3). According to the purification method disclosed by the invention, the iopamidol with a certain concentration is subjected to ultracentrifugation, so that a continuous density gradient can be quickly formed; and the purification method can be used for separating the exosome with relatively high purity and is beneficial to improving the purity of the obtained exosome.

The invention discloses a method for preparation of (S)-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxopropyl)amino]-2,4,6-triiodo-1,3-benzenedicarboxamide (iopamidol) shown in the formula I from 5-amino-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide shown in the formula II. The method comprises the following steps that a, the compound shown in the formula II and a mixed anhydride as an appropriate protective agent undergo a reaction to produce a mixed ester shown in the formula III; b, the mixed ester shown in the formula III and (S)-2-(acetoxy)propionyl chloride undergo a reaction so that an amino group at the 5th site is acylated and a compound shown in the formula IV is obtained; and c, the compound shown in the formula IV undergoes a hydrolysis reaction under acidic or alkaline conditions or undergoes an alcoholysis reaction so that all acyl groups of the compound shown in the formula IV are removed and the iopamidol shown in the formula III is obtained. The invention relates to a synthesis intermediate of the iopamidol shown in the formula III.

Embodiments are related to nonviral gene delivery vectors using only FDA-approved components: iopamidol, protamine, and ethiodized oil.