Tag: M.W:200-300

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 0 C solution of 2,4-dichloro-5-fluoropyrimidine (12.0 g, 71 .9 mmol) in dichloromethane (130 mL) was added triethylamine (20 mL, 140 mmol), followed by a solution of fe/f-butyl (2S)-2-methylpiperazine-1 -carboxylate (15.0 g, 74.9 mmol) in dichloromethane (70 mL). The reaction mixture was stirred at 30 C for 15 hours, whereupon it was washed sequentially with water (150 mL) and with saturated aqueous sodium chloride solution (100 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Purification via chromatography on silica gel (Gradient: 20% to 50% EtOAc in petroleum ether) afforded C35 as a white solid. Yield: 21 .4 g, 64.7 mmol, 90%. LCMS m/z 330.9 [M+H]+. 1H NMR (400 MHz, CDCI3) d 7.94 (d, 1 H), 4.54- 4.45 (m, 1 H), 4.39-4.29 (m, 1 H), 4.28 (br d, 1 H), 3.94 (br d, 1 H), 3.35 (dd, 1 H), 3.25-3.06 (m, 2H), 1 .48 (s, 9H), 1 .17 (d, 3H).

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

Reference£º
Patent; PFIZER INC.; ASPNES, Gary Erik; BAGLEY, Scott W.; CONN, Edward L.; CURTO, John M.; EDMONDS, David James; FLANAGAN, Mark E.; FUTATSUGI, Kentaro; GRIFFITH, David A.; HUARD, Kim; LIMBERAKIS, Chris; MATHIOWETZ, Alan M.; PIOTROWSKI, David W.; RUGGERI, Roger B.; (149 pag.)WO2019/239371; (2019); A1;,
Piperazine – Wikipedia
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169447-70-5, (S)-tert-Butyl 2-methylpiperazine-1-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

A solution of 1 ,1 -dimethylethyl (2S)-2-methyl-1-piperazinecarboxylate(100 mg, 0.5 mmol) in CH2CI2 (5 ml_) was mixed with 3-bromo benzaldehyde (0.06 ml_, 0.5 mmol) and NaB(OAc)3H (0.16 g, 0.75 mmol). The resulting mixture was stirred for 12 hours, diluted with dichloromethane (30 ml_) and washed with brine (50 ml_). The organic layer was collected, dried over Na2SO4 and concentrated. Separation via a combiflash system then afforded the title compound (150 mg, 81%): LC/MS: m/z, 369 (M+H); 1HNMR (MeOD) delta 1.26 (3H, d), 1.47 (9H, s), 2.0 (1 H, m), 2.1 (1 H, m), 2.6 (1 H, m), 2.8 (1 H, m), 3.1 (1 H, m), 3.3 (2H, s), 3.4 (1 H, m), 3.5 (1 H, m), 3.8 (1 H, m), 4.2 (1 H, m), 4.88 (1 H, s), 7.25 (1 H, m), 7.3 (1 H, m), 7.4 (1 H, m), 7.55 (1 H, s).

169447-70-5, The synthetic route of 169447-70-5 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; GLAXO GROUP LIMITED; WO2006/55553; (2006); A2;,
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.78551-60-7,tert-Butyl 4-benzyl-3-oxopiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

EXAMPLE 42 4-t-butoxycarbonyl-3-[2-(methylthio)ethyl)-1-(phenylmethyl)piperazinone (XVI) Following the general procedure of Example 47 and making non-critical variations, but substituting 4-t-butoxycarbonyl-1-(phenylmethyl)piperazinone (XV, Example 41) for 1-methyl-4-(phenylmethyl)piperazinone and 1-chloro-2-(methylthio)ethane [Chem. Ber., 84, 911 (1951)] for 1-bromo-2-methylpropane, there is obtained the title compound., 78551-60-7

As the paragraph descriping shows that 78551-60-7 is playing an increasingly important role.

Reference£º
Patent; The Upjohn Company; US4251438; (1981); A;,
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.70261-81-3,1-Methyl-4-(4-nitrobenzyl)piperazine,as a common compound, the synthetic route is as follows.,70261-81-3

A mixture of 1-methyl-4-(4-nitro-benzyl)-piperazine (3.09 g, 13.1 mmol), zinc dust (4.29 g, 65.6 mmol) and ammonium chloride (2.81 g, 52.5 mmol) in methanol (100 mL) was refluxed 1h, cooled, filtered through Celite (washing with methanol) and evaporated to provide 4-(4-methyl-piperazin-1-ylmethyl)-phenylamine (2.67 g, 99% yield) as a pale yellow, waxy solid. 1H-NMR (DMSO-d6, 500 MHz) 6.89 (d, 2H), 6.49 (d, 2H), 4.89 (s, 2H), 3.24 (s, 2H), 2.3 (br m, 8H) ppm; MS (FIA) 206.2 (M+H); HPLC (Method A) co-elutes with solvent front.

The synthetic route of 70261-81-3 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; VERTEX PHARMACEUTICALS INCORPORATED; WO2004/46120; (2004); A2;,
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With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.70261-82-4,4-(4-Methylpiperazin-1-ylmethyl)phenylamine,as a common compound, the synthetic route is as follows.

Preparation of 2,4-dihydroxy-5-isopropyl-N-(4-((4-methylpiperazin-l- yl)methyl)phenyl)- benzothioamide (K): [00447] To a stirred solution of 5.0g (21.89mmols) of 2,4-dihydroxy-5- isopropylbenzodithioic acid (J) in 30mL of anhydrous DMF was added 5.9g (70.07mmols) of NaHC03 followed by 2.55g (21.89mmols) of sodium 2-chloroacetate and the mixture was heated at 80 C for lh. 4-((4-methylpiperazin-l-yl)methyl)aniline (4.3g, 20.80mmols) was then added portion wise and the mixture was further heated at 80 C for 2h. The reaction mixture was then cooled, lOOmL of ice-water was added and the pH of the mixture was brought down to approx. 7 using saturated NH4CI solution. The resultant precipitate was then filtered, dried and redissolved in 9:1 ethyl acetate methanol, dried over Na2S04 and concentrated to afford compound K (7.8g) as yellow solid which was carried to next step without purification., 70261-82-4

As the paragraph descriping shows that 70261-82-4 is playing an increasingly important role.

Reference£º
Patent; SYNTA PHARMACEUTICALS CORP.; CHIMMANAMADA, Dinesh, U.; YING, Weiwen; WO2013/152206; (2013); A1;,
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Piperazines – an overview | ScienceDirect Topics

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.196811-66-2,tert-Butyl 4-carbamothioylpiperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

Step e) 4-[2-(4-tert-Butoxycarbonylpiperazin-1-yl)-5-methylthiazol-4-yl]benzoic acid methyl ester All of the alpha-bromoketone above and 4-thionocarbonylpiperazine-1-carboxylic acid tert-butyl ester (J. Med. Chem., 1998, 5037-5054, 917 mg, 3.73 mmol) were refluxed in 36 mL THF at 70 C. for 2 h, under N2. The precipitate was filtered and the filtrate concentrated in vacuo to give a yellow solid. Flash column chromatography (silica, 5/1 petroleum ether-EtOAc) gave 624 mg of light yellow solids. Chromatography of the precipitate (silica, 2/1 petroleum ether-EtOAc) gave a further 32 mg of compound. Total yield is 44%. 1H NMR (CDCl3) delta ppm: 1.46 (s, 9H), 2.43 (s, 3H), 3.42, (m, 4H), 3.54 (m, 4H), 3.90 (s, 3H), 7.68 and 8.04 (ABq, 4H).

196811-66-2, The synthetic route of 196811-66-2 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Nilsson, Magnus; Oden, Lourdes; Kahnberg, Pia; Grabowska, Urszula; US2009/23748; (2009); 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.

Yellow solid; IR (KBr, cm-1): v 3284 (-NH), 3069-3078 (-CH str.), 2223 (CN), 1255 (C-O-C), 836 (s-triazine C-N str.), 749 (C-F). 1H NMR (400 MHz, Me2SO-d6): delta 9.22 (s, 1H, -NH, s-triazine to amino-benzonitrile linkage), 8.10 (dd, J = 1.7, 1.1 Hz, 1H, C5 proton of coumarin), 7.61-7.64 (m, 1H, coumarin), 7.45 (t, J = 8.5 Hz, 1H, C6 proton of coumarin), 7.33-36 (m, 1H, coumarin), 7.29-6.90 (9H, m, Ar-H), 3.87 (4H, br s, piperazine), 3.48 (4H, br s, piperazine). 13C NMR (100 MHz, Me2SO-d6): delta 175.4 (1C, C-6, s-triazine, C-N at piperazine linkage), 167.2 (1C, C-4, s-triazine, C-O-C at quinoline linkage), 165.9, 163.8 (2C, 1C at C-2, s-triazine, C-NH at benzonitrile moiety and 1C of CO), 152.9 (1C of C-9, coumarin), 148.3-119.6 (19C, Ar. C including C-CF3 at 129.7 and CF3 at 126.1), 106.1 (1C, CN), 97.4 (1C, -C-CN), 48.6, 46.2 (4C, piperazine ring carbon atoms). 19F NMR (400 MHz, CDCl3): delta -65.33 (3F, s, 4-CF3)., 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; Patel, Rahul V.; Kumari, Premlata; Rajani, Dhanji. P.; Chikhalia, Kishor H.; Journal of Fluorine Chemistry; vol. 132; 9; (2011); p. 617 – 627;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

208167-83-3, tert-Butyl 4-(2-chloroethyl)piperazine-1-carboxylate is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a solution of tert-butyl 4-(2-chloroethyl)piperazine-1-carboxylate (1.00 g, 4.02 mmol, 1.00 eq), 4-benzyloxyphenol (965 mg, 4.82 mmol, 1.20 eq) in N,N-dimethylformamide (20 mL) was added cesium carbonate (1.57 g, 4.82 mmol, 1.20 eq) and potassium iodide (66 mg, 0.4 mmol, 0.10 eq) under nitrogen. The reaction was stirred at 80 C. for 10 hours. TLC (Petroleum ether/Ethyl acetate=3/1) and LCMS showed most of the starting material was consumed. Water (100 mL) was added to the mixture, the resulting mixture was extracted with Ethyl acetate (50 mL*3). The combined organic phase was washed with brine (80 mL), dried over sodium sulfate, filtered and concentrated in vacuum. The residue was purified by silica gel chromatography (Petroleum ether/Ethyl acetate=50/1 to 3/1). tert-butyl 4-[2-(4-benzyloxyphenoxy)ethyl]piperazine-1-carboxylate (1.4 g, 3.39 mmol, 84% yield) was obtained as a colorless oil. Chemical Formula: C24H32N2O4, Molecular Weight: 412.5 Total H count from HNMR data: 32. ?H NMR: (400 MHz, CHEOROFORM-d)oe: 7.46-7.29 (m, 5H), 6.95-6.88 (m, 2H), 6.88-6.812H), 5.02 (s, 2H), 4.07 (t, J=5.8 Hz, 2H), 3.5 1-3.42 (m, 4H), 2.80 (t, J=5.8 Hz, 2H), 2.56-2.48 (m, 4H), 1.47 (s, 9H)

208167-83-3, The synthetic route of 208167-83-3 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Arvinas, Inc.; Crew, Andrew P.; Berlin, Michael; Dong, Hanqing; Homberger, Keith R.; Qian, Yimin; Snyder, Lawrence B.; Wang, Jing; Zimmermann, Kurt; (504 pag.)US2018/215731; (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.182181-38-0,3-Fluoro-4-(piperazin-1-yl)benzonitrile,as a common compound, the synthetic route is as follows.

Combine 1-(4-cyano-2-fluorophenyl)piperazine (1.57 g, 7.6 mmol) and Et3N (1.28 ml, 9.2 mmol) in CH2Cl2 (10 ml) and add Boc2O (1.67 g, 7.6 mmol). Stir 1 h wash with satd. NaHCO3. Dry (MgSO4) and concentrate to obtain the crude carbamate as a yellow solid.

182181-38-0, As the paragraph descriping shows that 182181-38-0 is playing an increasingly important role.

Reference£º
Patent; Schering Corporation; US2005/239795; (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.278788-66-2,(R)-tert-Butyl 3-(hydroxymethyl)piperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

Step A: tert-Butyl (3R)-4¡¤:f2-( 4-cyano-3-:methoxyphenyl)-2-hydroxyethyl]-3 (hydroxymethyl)piperazine1-carboxylate; A Pyrex vessel was charged with magnetic stirring bar, (2.0 g, 11.42mmol) of 2-methoxy-4-( oxiran-2-yl) benzonitrile, (3. 70 g, 17.12 mmol) of tert-butyl (3R)-3-(hydroxymethyl)piperazine-1-carboxylate, and 6 mL ofEtOH. Then it was introduced in themicrowave reactor and irradiated at 150 C for 3 h. The mixture was cooled to room temperatureand the solvent was evaporated and the resulting residue was purified by column chromatography (silica gel, 1- 20% dichloromethane/MeOH) which afforded the product as a mixture of twodiastereomers (1 :1) LC/MS: (IE, m/z) [(M + 1)- t-Bu]+ = 336.41

278788-66-2, The synthetic route of 278788-66-2 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; MERCK SHARP & DOHME CORP.; PASTERNAK, Alexander; BLIZZARD, Timothy; CHOBANIAN, Harry; DE JESUS, Reynalda; DING, Fa-Xiang; DONG, Shuzhi; GUDE, Candido; KIM, Dooseop; TANG, Haifeng; WALSH, Shawn; PIO, Barbara; JIANG, Jinlong; WO2013/28474; (2013); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics