53 results about "Propanoyl chloride" patented technology

The invention relates to the technical field of medicine preparation, and discloses a preparation method of rotigotine, which uses 5-methoxy-2-tetralone as an initial raw material, reacts with R-α-methylbenzylamine, and undergoes desorption Benzyl reduction, chiral resolution of S-mandelic acid, and then react with propionyl chloride reagent to generate amide compound, then reduce it with sodium borohydride reagent, and finally react with 2-(thiophen-2-yl) 2-nitrobenzenesulfonic acid ethyl Ester reaction to give rotigotine. The preparation process route is that the rotigotine of the present invention has mild preparation conditions, simple operation, high yield of key intermediates, high optical purity, easy industrial scale-up production, and good application prospects.

A preparation method of 3,3,3-trifluoropropionic acid. The preparation method of the present invention first uses 2-chloro-1-1-difluoroethylene (a) as a raw material to perform carbonyl insertion reaction with carbon monoxide to obtain 3,3-difluoro 2-acryloyl chloride (b); then use HF to treat 3 ,3‑Difluoro 2‑acryloyl chloride is subjected to fluorination reaction to obtain 3,3,3‑trifluoropropionyl fluoride (c), and finally 3,3,3‑trifluoropropionyl fluoride is hydrolyzed to obtain trifluoropropionyl fluoride Acid (d). The preparation method of the invention has cheap and easy-to-obtain raw materials, mild conditions, high conversion rate of starting materials, and the total yield of the three-step reaction can reach more than 50%.

The invention relates to an Alectinib intermediate and a preparation method of Alectinib. The method comprises the following steps of: carrying out condensation on 2-nitro-4-cyanophenyl acetate with 2-methyl-2-(4-ethyl-3-substituted)phenyl propionate / propionyl chloride, hydrolyzing ester groups, carrying out amination by dimethylamine hydrochloride, then carrying out a reduction-cyclization reaction to obtain an intermediate 2,3,6-trisubstituted indole derivative, and carrying out a cyclization reaction with a cyclization reagent to prepare Alectinib. The method has the advantages of cheap andeasily-obtained raw materials, short process flow and safe and simple operation; the related unit reactions have high unit reaction selectivity and small waste water amount; and green and simple production of the Alectinib is facilitated.

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.