Tag: M.W:200-300

170911-92-9, tert-Butyl 4-(4-aminophenyl)piperazine-1-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a 250 mL round bottom flask was added 5 g (18.1 mmol) of crude I-f,Nitro-lH-pyrazole-3-carboxylic acid (3.1 g, 19.9 mmol)EDC · HCl 4.1 g (21.7 mmol),HOBt 2.9 g (21.7 mmol) and anhydrous DMF 50 mL,Stir at room temperature for 24 hTLC detects the disappearance of the starting material (methanol: chloroform = 1:10).The reaction solution was poured into 200 mL of ice water,Precipitation of a large number of light yellow solid, standing,Consider the yellow solid,The crude product was recrystallized from a mixed solvent of ethyl acetate and methanol to give 4.7 g of (I-g)Yield 62.4%., 170911-92-9

As the paragraph descriping shows that 170911-92-9 is playing an increasingly important role.

Reference：
Patent; China Pharmaceutical University; Lu Shuai; Wang Yue; Zhi Yanle; Yao Chao; Lu Tao; Li Baoquan; Chen Puzhou; Bao Jiyin; (27 pag.)CN107245073; (2017); A;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

129799-15-1, Methyl 1-Boc-piperazine-2-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a solution of 7-benzyl-2,4-dichloro-6,8-dihydro-5H-pyrido [3,4-d] pyrimidine (5.00 g, 17.0 mmol) and 1-tert-butyl 2-methylpiperazine-1,2-dicarboxylate (4.24 g, 17.3 mmol) in DMSO (80 mL) was added DIEA (5.49 g, 42.5 mmol, 7.42 mL). After stirring at 55° C. for 12 hours, the mixture was diluted with ethyl acetate (100 mL), washed with brine (3 150 mL), dried over Na 2SO 4, filtered and concentrated under vacuum. The residue was purified by column chromatography (SiO 2, PE/EA=3/1) to give 1-tert-butyl 2-methyl 4-(7-benzyl-2-chloro-6,8-dihydro-5H-pyrido[3,4-d] pyrimidin-4-yl)piperazine-1,2-dicarboxylate (8.00 g, 15.9 mmol, 93.8% yield) as a yellow oil. ES+APCI MS m/z 502.1[M+H] +.

129799-15-1, As the paragraph descriping shows that 129799-15-1 is playing an increasingly important role.

Reference：
Patent; Mirati Therapeutics, Inc.; Array BioPharma Inc.; Blake, James F.; Burgess, Laurence E.; Chicarelli, Mark Joseph; Christensen, James Gail; Cook, Adam; Fell, Jay Bradford; Fischer, John P.; Marx, Matthew Arnold; Mejia, Macedonio J.; Savechenkov, Pavel; Vigers, Guy P.A.; Smith, Christopher Ronald; Rodriguez, Martha E.; US2019/144444; (2019); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

169447-86-3, (S)-tert-Butyl 2-benzylpiperazine-1-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Preparative Example beta; Preparation of 2-[(S)-4-Boc-3-benzylpiperazinyl]-6-chloropyrazine 115; To a solution of 2,6-dichloropyrazine 114 (0.1 g, 0.67 mmol.) and (S)-1-Boc-2- benzylpiperazine 107 (0.37 g, 1.34 mmol) in dioxane (2 mL) and trifluoromethylbenzene (2 mL) was added diisopropylethylamine (0.26 g, 2.0 mmol). The reaction mixture was heated in a microwave reactor at 1800C for 20 minutes. Ethyl acetate (100 mL) was added. The organic layer was washed with saturated ammonium chloride solution, water and brine. The organic layer was dried over sodium sulfate. The organic solvent was evaporated under reduced pressure. The crude product was purified by flash column chromatography to yield the desired 2- [(S)-4-Boc-3-benzylpiperazinyl]-6-chloropyrazine 115 (0.234 g, 0.6 mmol).

169447-86-3, As the paragraph descriping shows that 169447-86-3 is playing an increasingly important role.

Reference：
Patent; SCHERING CORPORATION; WO2007/126964; (2007); A2;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

548762-66-9,With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.548762-66-9,(2S,5R)-tert-Butyl 2,5-dimethylpiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

The solid from the previous step was dissolved in a mixture of N,N-diisopropylethylamine (0.7 mL, 4 mmol) and DMSO (0.7 mL, 10 mmol) and (2S,5R)-2,5-dimethyl-piperazine-1-carboxylic acid tert-butyl ester (590 mg, 2.7 mmol) was added and the reaction mixture heated at 120 C. overnight, concentrated by rotary evaporation, dissolved in a small amount of DCM and purified by silica gel chromatography (0-40% ethyl acetate:hexanes) to produce the title intermediate (613 mg, 57% yield) as a white solid. (m/z): [M+H]+ calcd for C24H27F4N4O4 591.12 found 591.4.

The synthetic route of 548762-66-9 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; THERAVANCE, INC.; US2012/114600; (2012); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

122833-04-9, 2-Methoxy-4-(4-methylpiperazin-1-yl)aniline is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

2-Methoxy-4-(4-methylpyridazin-1-yl)phenylamine (2.21 g, 1.0 eq) was added to compound l-1 (3.7 g, 1. Oeq) n-butanol (70 ml) In the solution, the reaction was carried out at 90 C for 2-3 hours. After the reaction was completed by TLC, the mixture was cooled to room temperature, filtered, washed and dried to give a red solid (4.6 g).

122833-04-9, As the paragraph descriping shows that 122833-04-9 is playing an increasingly important role.

Reference：
Patent; Chengdu University; Zhao Lifeng; Gou Xiaojun; (47 pag.)CN109384788; (2019); A;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

118753-66-5, tert-Butyl 4-aminopiperazine-1-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

General procedure: To a well-stirred solution of intermediate 5a (2.0 g,5.29 mmol) in ethanol (10 mL) was added 1-amino-4-methylpiperazine 9a (0.61 g, 5.29 mmol) and a drop of acetic acid,and the mixturewas stirred at 78 C for 2 h. The mixturewas cooledto room temperature and the resulting solid was collected byfiltration and purified by column chromatography to give the targetcompounds 6a-1 as a yellow solid in 75% yield. M.p: 228-230 C;

118753-66-5, 118753-66-5 tert-Butyl 4-aminopiperazine-1-carboxylate 22029174, apiperazines compound, is more and more widely used in various fields.

Reference：
Article; Wu, Yachuang; Ding, Xiudong; Yang, Yifeng; Li, Yingxiu; Qi, Yinliang; Hu, Feng; Qin, Mingze; Liu, Yajing; Sun, Lu; Zhao, Yanfang; European Journal of Medicinal Chemistry; vol. 185; (2020);,
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.129779-30-2,(3R,5S)-rel-tert-Butyl 3,5-dimethylpiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

To a 20 mL microwave reactor vial was added (3R,5S)-tert-butyl 3,5-dimethylpiperazine- 1 -carboxylate (250 mg, 1.1 67mmol), 1,3 -dibromo-5 -fluorobenzene(592 mg, 2.333 mmol), C52CO3 (950 mg, 2.92 mmol) and toluene (4 mL). The vessel was purged and degassed with N2, then 2,2?-bis(diphenylphosphino)- 1,1 ?-binaphthalene(109 mg, 0.175 mmol) and palladium(II) acetate (52.4 mg, 0.23 3 mmol) were added. The reaction vessel was purged and degassed again. The reaction vessel was capped and the mixture was stirred at 110 C overnight. The reaction mixture was filtered and washed with MeOH and then solvent was removed. The crude was diluted with EtOAc (20 mL),and washed with H20 (20 mL). The orange organic layer was washed with brine, dried over with MgSO4, then concentrated to give crude tert-butyl 4-(3-bromo-5-fluorophenyl) piperazine-1-carboxylate, which was then dissolved in 20% TFA in DCM. The mixture was stirred for 2 hours, concentrated, and then purified by SCX resin (CUBCX1-HL (Benzenesulfonyl, H.L. Resin, 5 g) to provide 1 -((cis)-4-(3 -bromo-5 -fluorophenyl)-3 ,5-dimethylpiperazine, which used directly for next step. LCMS (M+H) = 287.1, 289.1 (1:1 ratio).

129779-30-2, As the paragraph descriping shows that 129779-30-2 is playing an increasingly important role.

Reference：
Patent; BRISTOL-MYERS SQUIBB COMPANY; BHIDE, Rajeev S.; BATT, Douglas G.; CHERNEY, Robert J.; CORNELIUS, Lyndon A.M.; LIU, Qingjie; MARCOUX, David; NEELS, James; POSS, Michael A.; QIN, Lan-ying; RUAN, Zheming; SHI, Qing; SRIVASTAVA, Anurag S.; TINO, Joseph A.; WATTERSON, Scott Hunter; (532 pag.)WO2016/64957; (2016); 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.120737-59-9,tert-Butyl 3-methylpiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

120737-59-9, TO a solution of 2-cyclohexylamino-4, 6-dichloro-1, 3,5-triazine (example 7, step A) (706mg) in DCM (5mL) at 0°C was added 3-METHYL-PIPERAZINE-1-CARBOXYLIC acid tert- butyl ester (579mg) and DIPEA (502PL). The mixture was allowed to warm to room temperature and stirred for 1 hour. The mixture was extracted with DCM (20mL) and washed with HCl (20ml), 1M), solvent was then removed under reduced pressure to yield 2-CHLORO-4-CYCLOHEXYLAMINO-6- (4-TERT-BUTOXYCARBONYL-2-METHYLPIPERAZIN-1-YL)- 1,3, 5-triazine (840mg) as a white powder. MS M/Z 411. 0 (M+1).

The synthetic route of 120737-59-9 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; AKZO NOBEL N.V.; WO2005/11703; (2005); 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.314741-40-7,(S)-tert-Butyl 3-(hydroxymethyl)piperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

Sodium hydride (0.86 g, 21 mmol) was added to fert-butyl (3S)-3-(hydroxymethyl)piperazine-l-carboxylate (1.244 g, 5.75 mmol) in THF (40 ml) at rt. The resulting mixture was stirred at rt for 10 min. 7-Bromo-8-chloro-5,6-difluoroquinazolin-4-ol (1.7 g, 5.75 mmol) was added slowly and the resulting solution was stirred at 40C for 1 h. The reaction mixture was quenched with water (2 ml). The reaction mixture was adjusted to pH = 7 with 2M HCI. The crude product was purified by C18-flash chromatography (0 to 65% MeOH in water (0.1% TFA)) to afford ferf-butyl (3S)-3-{[(7-bromo-8-chloro-6-fluoro-4-hydroxyquinazolin-5-yl)oxy]methyl}piperazine-l-carboxylate (1.65 g, 58%) as a brown solid. XH NMR (400 MHz, DMSO) 1.35 (9H, s), 2.62-3.07 (2H, m), 3.11-3.19 (2H, m), 3.20-3.76 (1H, m), 3.80-3.88 (1H, m), 3.98-4.29 (3H, m), 8.23 (1H, s). m/z: ES+ [M+H]+ = 491., 314741-40-7

The synthetic route of 314741-40-7 has been constantly updated, and we look forward to future research findings.

Reference：
Patent; ASTRAZENECA AB; KETTLE, Jason, Grant; BAGAL, Sharanjeet, Kaur; EATHERTON, Andrew, John; FILLERY, Shaun, Michael; ROBB, Graeme, Richard; LAMONT, Scott, Gibson; KEMMITT, Paul, David; GOLDBERG, Frederick, Woolf; (158 pag.)WO2019/215203; (2019); 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.16154-62-4,1-(2-Chloro-4-nitrophenyl)-4-methylpiperazine,as a common compound, the synthetic route is as follows.

[3-Chloro-4-(4-methyl-1-piperazinyl)phenyl]amine: 1-(2-chloro-4-nitrophenyl)-4- methylpiperazine (13.5 g, 52.8 mmol) was dissolved in Methanol (200 mL), and treated with platinum(IV) oxide (0.120 g, 0.528 mmol). The reaction was evacuated and back filled with H2 twice, then stirred for 48 hours under an H2 atmosphere. The crude mixture was filtered through a pad of celite, washed with MeOH, and concentrated to give the title compound as an orange solid (12 g, 100%). 1H NMR (400 MHz, METHANOL-^) delta ppm 2.35 (s, 3 H) 2.62 (br. s., 4 H) 2.95 (br. s., 4 H) 6.63 (dd, J=8.53, 2.76 Hz, 1 H) 6.75 – 6.81 (m, 1 H) 6.90 – 6.97 (m, 1 H); MS (m/z) 226 (M+H+)., 16154-62-4

16154-62-4 1-(2-Chloro-4-nitrophenyl)-4-methylpiperazine 2837294, apiperazines compound, is more and more widely used in various fields.

Reference：
Patent; GLAXO GROUP LIMITED; CASILLAS, Linda, N.; CHAKRAVORTY, Subhas, J.; EIDAM, Patrick; HAILE, Pamela, A.; HUGHES, Terry, Vincent; LAKDAWALA SHAH, Ami; LEISTER, Lara, Kathryn; MILLER, Nathan, Andrew; RAHMAN, Attiq; SEHON, Clark, A.; WANG, Gren, Z.; ZHANG, Daohua; WO2011/120026; (2011); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics