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Synthesis and crystal form-transforming method of taltirelin

A technique for the synthesis of tatirelin, which is applied in the direction of peptides, etc., can solve the problems of difficult pharmaceutical β crystal form, easy racemization of the product, and low yield, so as to ensure safety, simple process, and easy large-scale production Effect

Inactive Publication Date: 2014-02-19
苏州中科天马肽工程中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for the synthesis and crystal transformation of tatirelin, to overcome the easy racemization of the product in the above-mentioned prior art, low yield, low purity and difficulty in obtaining a stable pharmaceutical β crystal form, etc. question

Method used

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  • Synthesis and crystal form-transforming method of taltirelin
  • Synthesis and crystal form-transforming method of taltirelin
  • Synthesis and crystal form-transforming method of taltirelin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Preparation of S-1-methyl-L-4,5-dihydroorotic acid (compound 6)

[0031] Dissolve 465g of sodium hydroxide (22.2mol) in 5.5L of water, cool down to 5°C, add 1500g of L-asparagine (11.3mol) while stirring, and maintain the temperature at 0-5°C. 141.8 g (13 mol) of ethyl chloroformate was added dropwise, keeping the temperature below 15°C. After the dropwise addition, adjust the pH to 9 with 4N sodium hydroxide solution, react at about 25°C for 4-5 hours, and monitor the reaction by TLC (chloroform:methanol:glacial acetic acid (V:V:V)=20:1:0.5) process. After the reaction was complete, the reaction solution was extracted twice with 2.5 L of dichloromethane, and the organic phase was discarded. Use 6N hydrochloric acid to adjust the pH of the aqueous phase to 2-3, cool and crystallize overnight. Suction filtration, washing the crystal once with cold water, and vacuum drying at 50°C (until the water content is less than 0.05%) gave 1850 g of white solid (Compou...

Embodiment 2

[0036] The preparation of embodiment 2 tatirelin (compound 11)

[0037] 2.1 Fmoc-His(Trt)-Pro-NH 2 Synthesis

[0038] 4465g Fmoc-His (Trt) -OH (7.2mol) and 910g Pro-NH 2 (7.9mol) was dissolved in 22L tetrahydrofuran and 5L water, then 1.18L N-methylmorpholine (10.8mol) and 2775g TBTU (8.64mol) were added, and the reaction was stirred at 25-30°C for 2-4 hours. TLC monitors the reaction process (methanol: dichloromethane = 1: 8), after the reaction is complete, adjust the pH to about 7 with a small amount of glacial acetic acid, evaporate the organic solvent under reduced pressure, add 20L ethyl acetate, separate the organic phase, and use Wash the organic phase with 7.5 L each of 5% citric acid, 3% sodium bicarbonate, and saturated brine once, and dry the organic phase with anhydrous magnesium sulfate for 2 hours. Filter off the desiccant, slowly add 140L of petroleum ether to the filtrate under stirring, and stir and crystallize at 25°C for 2 hours. After suction filtration,...

Embodiment 3

[0044] Embodiment 3 The crystallization and conversion crystal form of tatirelin

[0045] Purify and desalt the white trifluoroacetate crude product of 940g tatirelin (compound 11) by high performance liquid chromatography, obtain white solid 626g after freeze-drying, purification yield 83%, ESI-MS (M+H + ): 406.63 (molecular weight: 405.41).

[0046] Add 620g of lyophilized tatirelin into 1240mL of water, stir and heat to 35-40°C to dissolve, adjust the pH to 9 with saturated aqueous sodium carbonate solution, slowly cool to 5-10°C to crystallize, suction filter, and dry to obtain 582g of α Crystal (C 17 h 23 N 7 o 5 .4H 2 O). The HPLC purity is 99.2%, the melting point is 65-67°C, and the water content is 13%.

[0047] Add 500g of tatirelin α crystals into 1000mL of water, stir and dissolve completely at 35-40°C, then slowly add 100mL of ethanol, slowly cool down to 5-10°C to crystallize, filter with suction, and dry to obtain 466g of β-crystals. HPLC purity 99.6%, m...

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Abstract

The invention relates to synthesis and a crystal form-transforming method of taltirelin. An intermediate S-1-methyl-4,5-dihydro-orotic acid is synthesized by using L-asparagine as a starting material and through Friedel-Crafts acylation, esterification, methylation and hydrogenation; His(Trt)-Pro-NH2 is prepared by reacting Fmoc-His(Trt)-OH with Pro-NH2 and deprotecting; a taltirelin salt crude product is obtained by carrying out condensation reaction on S-1-methyl-4,5-dihydro-orotic acid and His(Trt)-Pro-NH2, adding trifluoroacetic acid, stirring, adding a crystallization solvent, stirring, suction filtering and washing; taltirelin is obtained by purifying, desalting and freeze-drying; and beta-taltirelin is obtained by adding taltirelin into pure water for dissolution and crystallization, adding methanol, stirring, crystallizing and suction-filtering. Racemization of a final product in medium test amplification is effectively controlled in the reaction processes; product purity is high; production security is guaranteed; and the synthesis and crystal form-transforming method are suitable for large-scale amplified production.

Description

technical field [0001] The invention relates to a preparation method of a tatirelin intermediate and a method for preparation and crystal transformation of tatirelin. Background technique [0002] Tatirelin (English name: Taltirelin) is a white crystalline powdery short peptide hydrate, chemical name (S)-N-[(hexahydro-1-methyl-2,6-dioxo-4-pyrimidine Base) carbonyl] -L-histidyl-L-prolinamide, is the world's first approved oral thyrotropin-releasing hormone (TRH), developed by Tanabe Seiyaku (Japan) company, listed in Japan in 2000 , is an analogue of thyrotropin-releasing hormone, which can stimulate the secretion of thyroid-stimulating hormone (TSH), enhance recognition and memory functions, and is suitable for improving ataxia in patients with spinocerebellar degeneration. [0003] The synthesis of tatirelin is relatively difficult, Suzuki et al. (J Med Chem, 1990, 33:2130-37) and the patent CN102002004A have reported the synthesis method of tatirelin with L-aspartic acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K5/097C07K5/093C07K1/16C07K1/06
Inventor 王良友林凡程张亮吴朝阳
Owner 苏州中科天马肽工程中心有限公司
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