Heterocyclic Building Blocks-piperazine

109384-27-2, 1-Methylpiperazin-2-one hydrochloride is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Example 51A 6-chloro-2-methyl-5-(4-methyl-3-oxopiperazin-1-yl)pyridazin-3(2H)-one [0791] A mixture of Example 18B (0.179 g, 1.0 mmol), 1-methylpiperazin-2-one, hydrochloric acid (0.301 g, 2 mmol), and triethylamine (0.405 g 4.0 mmol) in ethanol (10 mL) was heated under reflux for 16 hours. The solvent was removed, and the residue was purified by flash column chromatography on silica gel eluting with 1-5% methanol in ethyl acetate to afford 0.21 g (82%) of the title compound.

109384-27-2, As the paragraph descriping shows that 109384-27-2 is playing an increasingly important role.

Reference£º
Patent; HUBBARD, Robert D.; WANG, Le; PARK, Chang H.; SUN, Chaohong; McDANIEL, Keith F.; PRATT, John K.; SOLTWEDEL, Todd N.; WENDT, Michael D.; HOLMS, John H.; LIU, Dachun; SHEPPARD, George S.; US2013/331382; (2013); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

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.

General procedure: To a mixture of piperazine derivative (1.1 equiv) and benzimidazole-carboxylic acid derivative (1 equiv) in DMF (1 mL), (benzotriazol-1 -yloxy)tris(dimethylamino)phosphoniumhexafluorophosphate (BOP) (0.24 g, 0.55 mmol, 1 .3 equiv) and diisopropylethylamine(0.22 mL, 1.26 mmol, 3 equiv) were added. The reaction mixture was stirred at roomtemperature for 1 6h then NaCisat was added. The aqueous phase was extracted with ethylacetate (3x), then the combined organic phases were washed with 5percent NaHCO3 andNaCIsat, dried over MgSO4 and concentrated. The crude product was purified by columnchromatography (PE/EtOAc or CH2CI2/MeOH) to obtain the desired product, 31166-44-6

As the paragraph descriping shows that 31166-44-6 is playing an increasingly important role.

Reference£º
Patent; CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE; UNIVERSITE D’ORLEANS; AGROFOGLIO, Luigi; ROY, Vincent; PLEBANEK, Elzbieta; BESSIERES, Maxime; (105 pag.)WO2018/50771; (2018); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.150407-69-5,(S)-1-((Benzyloxy)carbonyl)-4-(tert-butoxycarbonyl)piperazine-2-carboxylic acid,as a common compound, the synthetic route is as follows.

A mixture of (S)- 1 -((benzyloxy)carbonyl)-4-(tert-butoxycarbonyl)piperazine-2- carboxylic acid (1 g, 2.744 mmol, 1.0 eq), 6-(trifluoromethyl)pyridin-2-amine (667 mg, 4.116 mmol, 1.5 eq), and EDCI (1.58 1 g, 8.232 mmol, 3.0 eq) in pyridine (50 mL) was stirred at r.t. for 6 h. The mixture was concentrated and purified by chromatography on silica gel column (PE/EA = 5/1, v/v) to give the crude (S)-1-benzyl 4-tert-butyl 2-((6-(trifluoromethyl)pyridin- 2-yl)carbamoyl)piperazine-1,4-dicarboxylate (900 mg, 65%) as a brown solid.

150407-69-5, The synthetic route of 150407-69-5 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; LIFESCI PHAMACEUTICALS, INC.; MCDONALD, Andrew; QIAN, Shawn; (241 pag.)WO2017/98328; (2017); A2;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

142-64-3, Piperazine Dihydrochloride is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Weigh 2,4-dichlorobenzoic acid 9.6g (0.05mol) was dissolved in 20ml of dry tetrahydrofuran was slowly added CDI8.9g (0.055mol), at room temperature for 4hAfter the reaction solution through a dropping funnel was added dropwise to a solution of constant piperazine dihydrochloride 20g (0.125mol), anhydrous piperazine 10g (0.125mol), 60ml of an aqueous solution of sodium chloride, 14g, and reacted for 5 hours at room temperature .After completion of the reaction by suction, the filtrate evaporated to remove THF, 10ml ethyl acetate again, NaOH saturated solution was adjusted to pH = 10, and the combined organic phase was extracted 3 times with ethyl acetate. The organic phase was dried over anhydrous sodium sulfate overnight, pumping filtered, spin dry ethyl acetate, the resulting white crystals is 1- (2,4-dichloro-benzoyl) piperazine crude product 5.8g, 45% yield.

142-64-3, The synthetic route of 142-64-3 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Xi’an Jiaotong University; Zhang, Jie; Lu, Wen; Dong, Jinyun; Pan, Xiaoyan; He, Langchong; Zhang, Tao; Wang, Sicen; Shen, Xiuxiu; (16 pag.)CN104262238; (2016); B;,
Piperazine – Wikipedia
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.154590-34-8,tert-Butyl 4-(2-fluoro-4-nitrophenyl)piperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

154590-34-8, Step B. 4-(4-Amino-2-fluoro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester. A solution of 4-(2-fluoro-4-nitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (9.30 g, 28.6 mmol) in EtOH (80 mL) was hydrogenated (H2, 50 Ps) in the presence of 10% Pd/C (0.50 g). After 2.5 h, the mixture was filtered and the filtrate was concentrated to yield the title compound (7.17 g, 85%). MS: mass calcd. for C15H22FN3O2, 295.17; m/z found, 296.2 [M+H]+. 1H NMR (CDCl3): 6.80-6.78 (m, 1H), 6.44-6.36 (m, 2H), 3.66-3.50 (m, 6H), 2.93-2.85 (m, 4H), 1.47 (s, 9H).

As the paragraph descriping shows that 154590-34-8 is playing an increasingly important role.

Reference£º
Patent; Bonaventure, Pascal; Carruthers, Nicholas I.; Chai, Wenying; Dvorak, Curt A.; Jablonowski, Jill A.; Rudolph, Dale A.; Seierstad, Mark; Shah, Chandravadan R.; Swanson, Devin M.; Wong, Victoria D.; US2007/100141; (2007); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.59878-57-8,1-(Cyclopropylcarbonyl)piperazine,as a common compound, the synthetic route is as follows.

59878-57-8, (e) Library Synthesis (10a-m)To a solution of 2-fluoro-5-(4-oxo-3,4,5,6,7,8-hexahydro-phthalazin-1-ylmethyl)-benzoic acid (22 mg, 0.07 mmol), in DMA (1 ml) was added HBTU (53 mg, 0.140 mmol), triethylamine (20 muL, 0.140 mol) and amine (0.140 mmol). The crude reaction mixture was stirred for 18 hours at room temperature and then submitted for preparative HPLC purification.

59878-57-8 1-(Cyclopropylcarbonyl)piperazine 2064235, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; Javaid, Muhammad Hashim; Menear, Keith Allan; Martin, Niall Morrison Barr; Smith, Graeme Cameron Murray; Rudge, David Alan; Roberts, Craig Anthony; US2009/23727; (2009); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

848482-93-9, (S)-4-(tert-Butoxycarbonyl)piperazine-2-carboxylic acid is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

848482-93-9, To a stirred suspension of (5)-4-(tert-butoxycarbonyl) piperazine-2-carboxylic acid (1.0 g, 4.34 mmol) in water (5 rnL) was added solid NaHC03 (0.73 g, 8.68 mmol) at room temperature. The reaction mixture was stirred at room temperature to get clear solution. Solution of CBZ-CI (1.22 mL, 8.68 mmol) in 1,4-dioxane (10 mL) was added dropwise and the reaction mixture was stirred at room temperature for 16 h. The reaction mixture was diluted with water (20 mL) and extracted with EtOAc (2×20 mL). The aqueous layer was acidified with 0.5M aqueous HC1 to pH 5 and extracted with EtOAc (2×50 mL). The combined organic layers were dried over anhydrous a2S04, filtered, and concentrated under reduced pressure to afford the title compound (1.30 g) as white solid.

848482-93-9 (S)-4-(tert-Butoxycarbonyl)piperazine-2-carboxylic acid 1501850, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; MERCK SHARP & DOHME CORP.; BLIZZARD, Timothy Allen; BIFTU, Tesfaye; WO2013/148478; (2013); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.21043-40-3,1-Cyclopentylpiperazine,as a common compound, the synthetic route is as follows.

(General Procedure 16)4-Cyclopentyl-piperazine-1-carboxylic Acid pyrazol-1-yl Ester The title compound was prepared from 1-hydroxypyrazole and N-cyclopentylpiperazine applying the general procedure 16. The crude product was purified by preparative HPLC (water-acetonitrile-0.1% TFA) (34%, salt with TFA). 1H NMR (300 MHz; CDCl3): delta 1.45-2.01 (m, 8H), 2.70 (bs, 4H), 2.92 (bs, 1H), 3.55 (bt, 1H), 3.63 (bs, 2H), 3.77 (bs, 2H), 6.31 (t, 1H), 7.38 (dd, 1H), 7.41 (dd, 1H); HPLC-MS: m/z=265.1 (M+1); Rt=0.54 min., 21043-40-3

As the paragraph descriping shows that 21043-40-3 is playing an increasingly important role.

Reference£º
Patent; Ebdrup, Soren; de Jong, Johannes Cornelis; Jacobsen, Poul; Hansen, Holger Claus; Vedso, Per; US2003/166644; (2003); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.5521-39-1,2-(4-(4-Aminophenyl)piperazin-1-yl)ethanol,as a common compound, the synthetic route is as follows.,5521-39-1

30 mg of the 7-chloro-3-(2,4-dichloropyridin-3-yl)-4-imino-l-methyl-3,4- dihydropyrimido[4,5-rf]pyrimidin-2(lH)-one obtained in Production Example 2, and 16 mg of TsOH monohydrate were added to a 5-ml n-butanol solution containing 18.6 mg of 2-[4-(4- aminophenyl)piperazin-l-yl]ethanol, and the mixture was heat stirred for 15 minutes at 100C. The reaction mixture was concentrated under reduced pressure, and purified by basic column chromatography. As a result, 21 mg of a white solid was obtained as a subject compound. iH-NMR (400 MHz, CD3OD) delta: 8.97 (IH, s), 7.60-7.46 (5H, m), 7.00 (2H, d, J = 8.8 Hz), 3.76(2H, br s), 3.61 (3H, s), 3.24 (4H, br), 2.76 (4H, br s), 2.64 (2H, br). ESI-MS Found: m/z[M+H] 542

5521-39-1 2-(4-(4-Aminophenyl)piperazin-1-yl)ethanol 767100, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; BANYU PHARMACEUTICAL CO.,LTD.; BAMBA, Makoto; FURUYAMA, Hidetomo; SAKAMOTO, Toshihiro; SUNAMI, Satoshi; TAKAHASHI, Keiji; YAMAMOTO, Fuyuki; YOSHIZUMI, Takashi; WO2010/67886; (2010); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.169447-70-5,(S)-tert-Butyl 2-methylpiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

To a solution of 1 ,1-dimethylethyl (2S)-2-methyl-1-piperazinecarboxylate (1.5g, 7.5 mmol) in anhydrous DCM (3OmL) was added triethylamine (2.59ml_, 19 mmol) and phenyl-isocyanate (0.814ml_, 7.5 mmol) the mixture was stirred under an argon atmosphere at room temperature for 2hours. The reaction was evaporated and the residue was suspended DCM (3OmL) which was washed with (0.5M, aq) HCI (10OmL), and then water (10OmL). The collected organic layer was dried (MgSO4), filtered and evaporated to yield the title compound (1.96g, 82%)1H NMR (CDCI3) 51.21 (3H, d, J=6.8Hz), 1.48 (9H, s), 3.07 (1 H, br m), 3.20 (1 H, m), 3.30 (1 H, dd, J=13.37, 4.17Hz), 3.72 (1 H, m), 3.90 (2H, m), 4.28 (1 H, br m), 6.36 (1 H, NH, br m), 7.05 (1 H, m), 7.30 (2H, m), 7.35 (2H, m)., 169447-70-5

As the paragraph descriping shows that 169447-70-5 is playing an increasingly important role.

Reference£º
Patent; GLAXO GROUP LIMITED; BESWICK, Paul, John; CAMPBELL, Alister; CRIDLAND, Andrew; GLEAVE, Robert, James; PAGE, Lee, William; WO2010/102663; (2010); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics