Preparation method of linaclotide

A technology of linaclotide and linaclotide is applied in the field of preparation of linaclotide, which can solve the problems of low purity and yield of linaclotide, unfavorable purification and separation of products, unfavorable amplification and production, etc. Low price, easy to scale up production, reduce pollution effect

Pending Publication Date: 2021-12-31
HYBIO PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many defects in these methods: that is, the liquid phase cyclization is generally oxidized at a lower concentration, the reaction efficiency is low, and disulfide bond mismatches are prone to occur, and isomer impurities produce a large amount of impurities, which is not conducive to the purification of the product Separation, the purity and yield of the obtained linaclotide are relatively low, which is not conducive to industrial scale-up production

Method used

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  • Preparation method of linaclotide
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  • Preparation method of linaclotide

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preparation example Construction

[0034] The present invention discloses a preparation method of linaclotide, and those skilled in the art can learn from the content of this article and appropriately improve the process parameters to realize it. In particular, it should be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.

[0035] according to figure 2 According to the route shown, the crude linaclotide is synthesized, dissolved and filtered, and then purified by HPLC to obtain linaclotide refined peptide. Its st...

Embodiment 1

[0052] Embodiment 1: the synthesis of Fmoc-Tyr (tBu)-Wang Resin

[0053] Weigh 6.713 grams of Wang Resin with a substitution degree of 0.81 mmol / g, add it to a solid-phase reaction column, wash it twice with DMF, and swell the resin with DMF for 30 minutes. Weigh 6.893 grams of Fmoc-Tyr(tBu)-OH, 2.432 grams of HoBT, 0.220 grams of DMAP, dissolve with 30ml of DMF, add 3.018 grams of DIC to activate for 5min, add the mixed solution to the reaction column, and react at room temperature for 2-3 hours, the reaction process Nitrogen was used as protective gas. After the reaction was finished, the reaction liquid was drawn off, the resin was washed 3 times with DMF, and acetic anhydride and pyridine were added according to the molar ratio (1:1) to carry out the blocking reaction for 6 hours. The resin was shrunk with methanol and dried in vacuum to obtain Fmoc-Tyr(tBu)-Wang Resin. The degree of substitution of Fmoc-Tyr(tBu)-Wang Resin measured by ultraviolet spectrophotometer was 0...

Embodiment 2

[0054] Example 2: Synthesis of Linaclotide (5-14)-Wang Resin

[0055] Weigh 6.383 grams of Fmoc-Tyr(tBu)-Wang Resin with a degree of substitution of 0.47mmol / g, transfer it to a solid-phase reaction column, wash it twice with DMF, swell the resin with DMF for 30 minutes, and add 20% piperidine / DMF (V / V) solution for 5+10 minutes to remove the Fmoc protecting group on the peptide resin, after removal, wash the resin with DMF for 6 times, and the ninhydrin test result was positive, indicating that the deprotection was successful. Weigh 5.542 grams of Fmoc-Cys(Mmt)-OH, 1.459 grams of HOBt, dissolve with 15ml of DMF, add 1.688ml of DIC to activate for 5 minutes under ice-water bath conditions, add the mixed solution to the reaction column, react at room temperature for 2 hours, and react Nitrogen was used as a protective gas during the process, and the ninhydrin detection resin was colorless and transparent, indicating that the condensation was successful.

[0056] After the rea...

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Abstract

The invention relates to the field of polypeptide synthesis, in particular to a preparation method of linaclotide. According to the method, a synthesis strategy of fragment condensation is adopted, a forming process of three pairs of disulfide bonds is divided into three stages, the linaclotide 5-14 is synthesized through a solid phase method firstly, and a first pair of disulfide bonds Cys (5-13) is formed through DMSO oxidation; 2-CTC resin is used for synthesizing a full-protection peptide of linaclotide 2-4, the full-protection peptide of the linaclotide 2-4 and the linaclotide 5-14 are subjected to fragment condensation, and then, a second pair of disulfide bonds Cys (2-10) is formed through I2 oxidation; and finally, a third pair of disulfide bonds Cys (1-6) is formed through I2 oxidation in a liquid phase. According to the method, the three pairs of disulfide bonds can be efficiently paired, and the mispairing rate is lowered. The synthesis strategy is helpful for improving the purity and yield of the product, the raw materials are low in price and readily available, and large-scale production is facilitated.

Description

technical field [0001] The invention relates to the field of polypeptide synthesis, in particular to a preparation method of linaclotide. Background technique [0002] Linaclotide is a guanylate cyclase C (GC-C) receptor agonist developed by Ironwood Company of the United States. Its trade name is Linzess. It was approved by the FDA on August 30, 2012. The name is linaclotide. The drug is a capsule formulation for the treatment of adults with constipation-predominant irritable bowel syndrome (IBS-C) and chronic idiopathic constipation (CIC), and it is the first drug for the treatment of constipation with such a mechanism of action. [0003] The primary structure of linaclotide consists of 14 amino acids, including 6 cysteines in the sequence. Among them, cysteines (1-6), (2-10), and (5-13) respectively form 3 pairs of disulfide bonds. After oral administration into the human body, linaclotide binds to the guanylate cyclase type C receptor (GC-C) in the intestine, which in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K7/08C07K1/06C07K1/04C07K1/02
CPCC07K7/08Y02P20/55
Inventor 周天雄尹传龙唐洋明余品香
Owner HYBIO PHARMA
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