- Synthesis method of diphenyl pyrazine derivative
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The invention discloses a synthesis method of a diphenyl pyrazine derivative. The method is characterized in that benzil and glycinamide are used as raw materials, and a target product is prepared through five-step reaction. The obtained target product is high in purity, subsequent production of high-quality drugs is facilitated, and the synthesis method is reasonable in route design, mild in reaction condition, free of high-temperature reaction, good in safety and high in feasibility.
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- Preparation method of medical intermediate
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The invention provides a preparation method of a medical intermediate 2 - {4 - [(5, 6 - diphenylpyrazine -2 -yl) (propane -2 -yl) amino] butoxy} acetate. The crystallization method uses a mixed solvent composed of a hydrocarbon and an alcohol, the hydroca
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Paragraph 0027; 0028; 0030; 0031; 0033; 0034
(2021/10/11)
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- CRYSTAL
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A main object of the present invention is to provide a novel crystal of 2-{4-[N-(5,6-diphenylpyrazin-2-yl)-N-isopropylamino]butyloxy}acetic acid (hereinafter referred to as “Compound B”). A form-I crystal of Compound B, which shows peaks at diffraction an
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Paragraph 0094
(2020/08/12)
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- METHOD FOR PREPARING PROSTACYCLIN RECEPTOR AGONIST
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The present invention relates to preparation methods of a prostacyclin receptor agonist of 2-{4-[N-(5,6-diphenylpyrazin-2-yl)-N-isopropylamino]butyloxy}-N-(methylsulfonyl)acetamide and its intermediates. These methods are simple and convenient to operate, environment-friendly and suitable for industrial production to obtain the product with good yield and high purity.
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- POLYMORPHIC FORMS AND AMORPHOUS SOLID DISPERSION OF SELEXIPAG
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The present disclosure relates to crystalline forms of selexipag and their processes for preparation. The present disclosure also relates to an amorphous solid dispersion of selexipag and its processes for their preparation as well as premix of crystalline selexipag and their process.
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- Preparation method for therapeutic drug selexipag for treating pulmonary arterial hypertension of adults
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The invention discloses a preparation method for therapeutic drug selexipag for treating pulmonary arterial hypertension of adults. The therapeutic drug selexipag for treating pulmonary arterial hypertension of adults is prepared through 5-step reaction of starting materials 5-chlorine-2 and 3-diphenyl pyrazine. The invention aims to overcome the defect of higher cost of the present method, shorten the preparation process and provide the preparation method for the therapeutic drug selexipag for treating pulmonary arterial hypertension of adults that is mild in reaction, easy in operation and high in chiral purity.
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- PROCESS FOR THE PREPARATION OF SELEXIPAG AND INTERMEDIATES THEREOF
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The present invention provides processes for the preparation of Selexipag compound of formula (1). The present invention also provides processes for the preparation of 4-[(5,6-diphenyl-pyrazin-2-yl)-isopropyl -amino]-butan-1-ol (2), and 4-isopropylamino-butan-1-ol of formula (3), which are intermediates for the synthesis of Selexipag (1 ).
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- AN IMRPOVED PROCESS FOR THE PREPARATION OF SELEXIPAG OR ITS PHARMACEUTICALLY ACCEPTABLE SALTS
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The present invention provides an improved process for Selexipag of formula (I) or its pharmaceutically acceptable salts.
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- PROCESS FOR THE PREPARATION OF DIPHENYLPYRAZINE DERIVATIVES
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The present invention relates to a process for the preparation of amorphous Selexipag from Selexipag crystalline salts using a solvent.
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- High-purity match le xipa (by machine translation)
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The invention discloses a high-purity match le xipa. By the match le xipa key intermediate 2 - (4 - ((5, 6 - diphenyl pyrazine - 2 - yl) isopropyl amino) butoxy) acetic acid in the organic solvent with the CDI, a sulfonamide in the organic base under the conditions of the reaction. The reaction operation is simple, low cost, environment-friendly, yield>95%, it is suitable for industrial production, the purity of the prepared match le xipa ≥ 99.9%, can better meet the requirements of drug production. The invention prepared match le xipa high purity, thereby facilitating the subsequent more high-quality drugs. (by machine translation)
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- Selexipag: An Oral and Selective IP Prostacyclin Receptor Agonist for the Treatment of Pulmonary Arterial Hypertension
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Prostacyclin controls cardiovascular function via activation of the prostacyclin receptor. Decreased prostacyclin production occurs in several cardiovascular diseases. However, the clinical use of prostacyclin and its analogues is complicated by their chemical and metabolic instability. A medicinal chemistry program searched for novel nonprostanoid prostacyclin receptor agonists not subject to these limitations. A compound with a diphenylpyrazine structural core was synthesized. Metabolic stability and agonist potency were optimized through modification of the linear side chain. Compound 12b (MRE-269, ACT-333679) was identified as a potent and highly selective prostacyclin receptor agonist. Replacement of the terminal carboxyl group with an N-acylsulfonamide group yielded parent compound 26a (selexipag, NS-304, ACT-293987), which is orally active and provides sustained plasma exposure of 12b. Compound 26a was developed for the treatment of pulmonary arterial hypertension and shown to reduce the risk of the composite morbidity/mortality end point in a phase 3 event-driven clinical trial.
- Asaki, Tetsuo,Kuwano, Keiichi,Morrison, Keith,Gatfield, John,Hamamoto, Taisuke,Clozel, Martine
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p. 7128 - 7137
(2015/10/05)
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- Structure-activity studies on diphenylpyrazine derivatives: A novel class of prostacyclin receptor agonists
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To develop nonprostanoid prostacyclin receptor agonists with a high degree of metabolic resistance and an extended duration of action, a novel series of diphenylpyrazine derivatives was synthesized and evaluated for their inhibition of ADP-induced human platelet aggregation. Structure-activity relationship studies on the side chain containing the carboxylic acid moiety of the lead compound 5c showed that the length of the linker and the presence of the concatenating nitrogen atom adjacent to the pyrazine ring are critical for the antiaggregatory activity. This study led to the discovery of 2-amino-5,6-diphenylpyrazine derivatives 8c, 15a, and 15b, which showed potent inhibition of platelet aggregation with IC50 values of 0.2 μM. Among these compounds, 15b is an orally available and long-lasting prostacyclin receptor agonist which is promising for the treatment of various vascular diseases.
- Asaki, Tetsuo,Hamamoto, Taisuke,Sugiyama, Yukiteru,Kuwano, Keiichi,Kuwabara, Kenji
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p. 6692 - 6704
(2008/03/27)
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- HETEROCYCLIC COMPOUND DERIVATIVES AND MEDICINES
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The present invention provides a compound which is useful as a PGI2 receptor agonist, and a pharmaceutical composition. The present invention is directed to a pharmaceutical composition comprising a compound represented by the following formula [1]: (R1 and R2 are the same or different and each represents optionally substituted aryl, Y represents N or CH, Z represents N or CH, A represents NH, NR5, O, S, or ethylene, R5 represents alkyl, D represents alkylene or alkenylene, E represents phenylene or single bond, G represents O, S, or CH2, R3 and R4 are the same or different and each represents hydrogen or alkyl, Q represents carboxy, alkoxycarbonyl, tetrazolyl, carbamoyl, or N-(alkylsulfonyl)carbamoyl), or a pharmaceutically acceptable salt thereof as an active ingredient.
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