Heterocyclic Building Blocks-piperazine

192130-34-0, tert-Butyl 4-(2-aminoethyl)piperazine-1-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

66-1) 1-[2-(4-Fluorobenzenesulfonylamino)ethyl]-4-(t-butoxycarbonyl)piperazine The 1-(2-aminoethyl)-4-(t-butoxycarbonyl)piperazine (2.01 g) obtained in Example 58 and 4-fluorobenzene sulfonylchloride (2.05 g) were dissolved in tetrahydrofuran (20 ml), and triethylamine (2.4 ml) was added thereto, and the mixture was stirred overnight at room temperature. Water (50 ml) was added to the reaction mixture which was then extracted with ethyl acetate, and the organic layer was washed with water, dried, and evaporated. The residue was purified by Cromatorex NH silica gel column chromatography (hexane/ethyl acetate system), whereby the title compound (2.61g, 77percent) was obtained as a colorless oil., 192130-34-0

As the paragraph descriping shows that 192130-34-0 is playing an increasingly important role.

Reference£º
Patent; Eisai Co., Ltd.; EP1099692; (2001); A1;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.31166-44-6,1-Cbz-Piperazine,as a common compound, the synthetic route is as follows.

Compound BB-17-1 (7.0g, 31.78mmol) was dissolved in dilute hydrochloric acid (6M, 150mL) with stirring until homogeneous under nitrogen protectionskid slowly dropwise a solution of sodium nitrite (4N, 30 mL), then stirred at room temperature about one hour, 100mL of water was added with ethylacetate and extracted (100mL ¡Á 3).The combined organic phases were washed with saturated brine (20 mL), dried over anhydrous sodium sulfate, and under reduced pressure to removethe solvent, the resulting target compound BB-17-2 (7.5g, yield: 66%), was used directly in the next step without further purification.

31166-44-6, The synthetic route of 31166-44-6 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Changzhou Yin Sheng Pharmaceutical Co., Ltd.; Sichuan University; Zhang, Yang; Fu, Zhifei; Li, Jian; Chen, Shuhui; Wei, Yuquan; Tao, Xin; (65 pag.)CN105732602; (2016); A;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.934-98-5,2-(4-Methylpiperazin-1-yl)ethanamine,as a common compound, the synthetic route is as follows.

General procedure: I-c (0.6 g, 2.8 mM), 2-methoxyethanol (1.3 g, 17 mM) and sodium hydride (0.1 g, 2.8 mM, 60percent) in ethanol were heated to reflux for 5 h. The mixture was evaporated in vacuo and purified by silica gel column chromatography to get I-d-02 (0.6 g, 78.5percent) as a white solid., 934-98-5

As the paragraph descriping shows that 934-98-5 is playing an increasingly important role.

Reference£º
Article; Wang, Lu; Zhang, Qing; Zhu, Gaoyuan; Zhang, Zhimin; Zhi, Yanle; Zhang, Li; Mao, Tianxiao; Zhou, Xiang; Chen, Yadong; Lu, Tao; Tang, Weifang; European Journal of Medicinal Chemistry; vol. 130; (2017); p. 86 – 106;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.55276-43-2,1-Methanesulfonylpiperazine,as a common compound, the synthetic route is as follows.

Example 1; This Example illustrates the preparation of N- (3-phenyl-3- [4- METHANESULPHONYLPIPERAZIN-1-YL] PROPYL)-4- [2- (4-METHANESULPHONYLPHENYLSULPHONYL) ethyl] – piperidine (Compound No. 8, Table I). N- (3-Phenyl-3-chloropropyl)-4- [2- (4-methanesulphonylphenylsulphonyl) ethyl] – piperidine (prepared according to Method D; 180mg) was added to a solution of N- methanesulphonylpiperazine (61mg) and triethylamine (0. 102ML) in dichloromethane (10ML) and the mixture was allowed to stand at room temperature for 16 hours. The reaction mixture was poured onto a 20g silica Bond Elut eluted with a solvent gradient (ethyl acetate-25% methanol/ethyl acetate). The title compound was obtained, yield 67mg, MHF 612. NMR (CDC13) : 1.6-1. 8 (m, 7H), 2.2-2. 6 (m, 9H), 2.7 (m, 1H), 2.75 (s, 3H), 3.2 (m, 11H), 3.45 (m, 1H), 7.2 (d, 2H), 7.3 (m, 3H), 8.2 (m, 4H)., 55276-43-2

55276-43-2 1-Methanesulfonylpiperazine 709161, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; ASTRAZENECA AB; WO2004/56773; (2004); A1;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.30459-17-7,1-(4-Trifluoromethylphenyl)piperazine,as a common compound, the synthetic route is as follows.

EXAMPLE 74 (2-Cyclopent-1-enyl-5-methanesulfonyl-phenyl)-[4-(4-trifluoromethyl-phenyl)-piperazin-1-yl]-methanone Following procedure E, (2-Cyclopent-1-enyl-5-methanesulfonyl-phenyl)-[4-(4-trifluoromethyl-phenyl)-piperazin-1-yl]-methanone is prepared from 2-cyclopent-1-enyl-5-methanesulfonyl-benzoic acid (Example H) and 1-(4-trifluoromethyl-phenyl)-piperazine: colourless foam, MS (ISP): 479.5 (M+H+).

30459-17-7, As the paragraph descriping shows that 30459-17-7 is playing an increasingly important role.

Reference£º
Patent; Alberati-Giani, Daniela; Jolidon, Synese; Narquizian, Robert; Nettekoven, Matthias Heinrich; Norcross, Roger David; Pinard, Emmanuel; Stalder, Henri; US2005/59668; (2005); A1;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.934-98-5,2-(4-Methylpiperazin-1-yl)ethanamine,as a common compound, the synthetic route is as follows.,934-98-5

General procedure: To a solution of 2 (0.6 mmol) in MeOH/H2O/DMSO=2:1:1(4 mL)was added sodium hydroxide (6 mmol). The solution was warmed to 45 C, after being stirred for overnight, the mixture allowed to cool, and the MeOH was removed by rotary evaporation. To the resultant slurry 1M HCl was added, and the pH was adjusted to 4. Subsequently, the mixture was filtered and washed thoroughly with water, dried to afford a white solid, which was used without additional purification. A mixture of above acid (0.3 mmol), HOBt (0.36 mmol), EDCI (0.36 mmol)were dissolved in dry DMF(3 mL), and stirred for 20 min. Then, amine(0.6 mmol) were added, the mixture was stirred for overnight, diluted with EtOAc, washed with water (30 mL¡Á5), dried over anhydrous Na2SO4, filtered and evaporated under-reduced pressure. The crude product was purified by silica gel column chromatography to afford the corresponding product 3-26.

The synthetic route of 934-98-5 has been constantly updated, and we look forward to future research findings.

Reference£º
Article; Xiao, Xiao; Xu, Mei; Yang, Chao; Yao, Yao; Liang, Li-na; ED Chung, Philip; Long, Qun; Zacksenhaus, Eldad; He, Zhixu; Liu, Sheng; Ben-David, Yaacov; Bioorganic and Medicinal Chemistry; vol. 26; 23-24; (2018); p. 6096 – 6104;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.30459-17-7,1-(4-Trifluoromethylphenyl)piperazine,as a common compound, the synthetic route is as follows.

General procedure: To the stirred solution of 3-(3-oxo-2H-benzo[b][1,4]thiazin-4(3H)-yl)propanoic acid (100mg, 0.448 mol) in DMF, N-phenyl piperzine derivatives (0.538 mol) or 3-(4-phenylpiperazin-1-yl)propan-1-amine derivatives (0.538 mol) was added at room temperature, followed by the addition of EDC:HCl (102 mg) and HOBt (60.5 mg), the stirring was continued for 12h. After completion of the reaction (TLC analysis), small amount of ice cold water (10 mL) was added to the reaction mixture and then extracted with chloroform (2 x 10 mL). The chloroform layer was separated, dried over Na2SO4 and evaporated under vacuum to give corresponding derivatives 8a-i and 10a-g in good yields., 30459-17-7

30459-17-7 1-(4-Trifluoromethylphenyl)piperazine 121718, apiperazines compound, is more and more widely used in various fields.

Reference£º
Article; Venkatesh, Ramineni; Kasaboina, Suresh; Bidayat, Deepthi; Nikhil Kumar; Jain, Nishant; Tangeda, Saritha Jostna; Bantu, Rajashaker; Janardhan, Sridhara; Nagarapu, Lingaiah; Bioorganic and Medicinal Chemistry Letters; vol. 27; 2; (2017); p. 354 – 359;,
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59702-07-7, 1-Methylpiperazin-2-one is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

59702-07-7, Intermediate 62 : 2-f3-f4-Methyl-3-oxopiperazin-l-vnpropynisoindoline-l,3- dione (0595) To a mixture of 3-(l,3-dioxoisoindolin-2-yl)propanal (515 mg, 2.53 mmol, commercially available from Fluorochem) and Na(OAc)3BH (815.9 mg, 3.85 mmol) in 2-MeTHF (20 mL) was added l-methylpiperazin-2-one (0.420 mL, 3.82 mmol, commercially available from Fluorochem). The mixture was stirred at rt for 4 h 45 min. To the reaction mixture was added aqueous 2M Na2C03 (10 mL) and this mixture stirred at rt for 10 min giving an aqueous phase at approximately pH 10. The layers were separated and the aqueous layer washed with EtOAc (2 x 10 mL). The organic layers were filtered through a cartridge fitted with a hydrophobic frit and the filtrate evaporated in vacuo to give a pale yellow crystalline solid. 2-(3-(4-methyl-3-oxopiperazin-l-yl)propyl)isoindoline-l,3-dione (660.5 mg, 2.192 mmol, 86 percent yield). (0596) LCMS (2 min high pH); Rt = 0.74 min, m/z = 302 for [MH]+

The synthetic route of 59702-07-7 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; GLAXOSMITHKLINE INTELLECTUAL PROPERTY (NO.2) LIMITED; ATKINSON, Stephen John; DEMONT, Emmanuel Hubert; HARRISON, Lee Andrew; LEVERNIER, Etienne; PRESTON, Alexander G; SEAL, Jonathan Thomas; WALL, Ian David; WATSON, Robert J; WOOLVEN, James Michael; (225 pag.)WO2017/174621; (2017); A1;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.57260-70-5,tert-Butyl 4-benzylpiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

57260-70-5, The procedure described for the preparation of 2a was used with compound 10c (400 mg, 1.22 mmol), 13a (322 mg,1.83 mmol), K2CO3 (337 mg, 2.44 mmol), NaI (catalyst) and CH3CN(15 mL) to obtain 2c (296 mg, 52%) as light brown liquid. Rf = 0.56(n-hexane: EtOAc: MeOH = 2.5:1.5:1). 1H NMR (500 MHz, CDCl3): d7.38-7.23 (m, 15H), 5.86 (s, 1H), 4.61 (t, J = 7 Hz, 2H), 3.54 (s, 2H),2.48-2.00 (m, 10H), 2.07-2.02 (m, 2H), 1.52-1.49 (m, 2H); 13CNMR (125 MHz, CDCl3): d 167.8, 140.9, 138.2, 129.2, 128.7, 128.6,128.2, 127.1, 127.0, 63.1, 57.6, 53.2, 53.1, 53.0, 48.7, 27.4, 23.6.

57260-70-5 tert-Butyl 4-benzylpiperazine-1-carboxylate 584330, apiperazines compound, is more and more widely used in various fields.

Reference£º
Article; Paudel, Suresh; Acharya, Srijan; Yoon, Goo; Kim, Kyeong-Man; Cheon, Seung Hoon; Bioorganic and Medicinal Chemistry; vol. 25; 7; (2017); p. 2266 – 2276;,
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115761-79-0, 1-(2,4-Difluorophenyl)piperazine is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

A solution of Intermediate?A? (200 mg, 0.55 mmol), l-(2,4-difluorophenyl)- piperazine (328 mg, 1.65 mmol), and Et3N (170 mg) in CH2CI2 (5 g) was stirred for 16 h at rt, then extracted with 2×30 mL of CH2CI2. The combined organic layers were concentrated under vacuum and purified with silica gel column chromatography using EtOAc / hexane (1:1) to afford 240 mg (97%) of the title compound as an off-white solid. LC-MS: (ES, m/z): 449.

115761-79-0, As the paragraph descriping shows that 115761-79-0 is playing an increasingly important role.

Reference£º
Patent; CENTAURUS THERAPEUTICS; ROMERO, Donna, L.; BLITZER, Jeremy; (242 pag.)WO2019/140188; (2019); A1;,
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