Month: April 2021

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.74879-18-8,(S)-(+)-2-Methylpiperazine,as a common compound, the synthetic route is as follows.,74879-18-8

EXAMPLE 213A (3S)-3-methyl-1-(2-pyridinyl)piperazine A solution of (S)-(+)-2-methylpiperazine (0.50 g, 0.005 mol, CAS 74879-18-8, Aldrich 39,717-2, 99%) and 2-bromopyridine (5 mL, 0.05 mol) was heated to 120 C. for 14 hours. The reaction mixture was cooled to 23 C. and partitioned between ethyl acetate and water. The layers were separated, and the water layer extracted twice more with ethyl acetate. The aqueous phase was adjusted to pH~11 with a solution of saturated sodium bicarbonate and solid sodium carbonate. Sodium chloride was added, and the saturated aqueous solution was extracted with ethyl acetate (2*) and dichloromethane (2*). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated under reduced pressure to afford 0.6 g (67% yield) of the title compound. 1H NMR (400 MHz, DMSO-d6) delta1.02 (d, J=6.0 Hz, 3H), 2.27 (dd, J=12, 10 Hz, 1H), 2.67 (m, 3H), 2.92 (m, 1H), 4.07 (m, 2H), 6.58 (dd, J=8, 6 Hz, 1H), 6.77 (d, J=8 Hz, 1H), 7.49 (m, 1H), 8.08 (m, 1H); MS (ESI) m/e 178 (M+H)+.

As the paragraph descriping shows that 74879-18-8 is playing an increasingly important role.

Reference£º
Patent; Bhatia, Pramila A.; Daanen, Jerome F.; Hakeem, Ahmed A.; Kolasa, Teodozyj; Matulenko, Mark A.; Mortell, Kathleen H.; Patel, Meena V.; Stewart, Andrew O.; Wang, Xueqing; Xia, Zhiren; Zhang, Henry Q.; US2004/29887; (2004); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

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

Methyl chloroformate (230 1iL, 3 mmol) was slowly added at 0C to a solution of tert-butyl (25)-2-methylpiperazine-i-carboxylate (300 mg, 1.5 mmol) and triethylamine (835 1iL, 6 mmol) in methylene chloride (6 mL). After stirring at r.t. for 1 h, reaction mixture wascarefully quenched by addition of water and the desired product was extracted with ethyl acetate. The organic phase was washed with brine, dried over sodium sulfate and solvent was evaporated under reduced pressure. Cmde material was purified by Biotage IsoleraTM to give (5)-i -tert-butyl 4-methyl 2-methylpiperazine- 1 ,4-dicarboxylate (378 mg, 97%). LCMS calculated for C7H15N202 (M+H-Boc) m/z = 159.1; found: 159.1., 169447-70-5

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

Reference£º
Patent; INCYTE CORPORATION; VECHORKIN, Oleg; LI, Yun-Long; SOKOLSKY, Alexander; WANG, Anlai; ZHU, Wenyu; ZHUO, Jincong; (185 pag.)WO2017/59251; (2017); 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.

To a solution of sodium bicarbonate (6.5 mmol) in water (2 mL) and DCM (10 mL) at 00C is added bromoacetyl bromide (6.5 mmol), followed by immediate addition of 1-cyclopentylpiperazine (3.25 mmol). The mixture is stirred at 00C for an additional 40 min. To the mixture is added aqueous sodium bicarbonate (15 mL) and DCM (30 mL). The layers are separated and the organic layers dried (MgSO^ and solvent removed in vacuo to give the title compound, which is used in the next step reaction without further purification.

21043-40-3, The synthetic route of 21043-40-3 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; NEUROGEN CORPORATION; WO2007/16496; (2007); A2;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

75336-86-6, (R)-2-Methylpiperazine is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a 250 mL flask containing 100 mL toluene was added 2.45 g sodium t-butoxide (25.5 mmol, 1.5 equiv), 191 mg palladium acetate (0.85 mmol, 0.05 equiv) and 517 mg tri-/?-tolylphosphine (1.7 mmol, 0.1 equiv) under N:*. After stirring for 20 mm., 3.Og 1 -bromo-4-fluorobenzene (17.0 mmol, 1.0 equiv) and 1.71 g (/?)-2-methylpiperazine (17.0 mmol, 1.0 equiv) were added to the solution. The resulting mixture was placed into a preheated 110 0C bath. After stirring for 7 h, the mixture was cooled to room temperature and stirred overnight. The mixture was filtered though a plug of celite. The celite plug was washed with 2 x CH2Cl2. The organics were dried (MgSO4) and concentrated under reduced pressure. Flash chromatography of the residue (SiO2, 2percent MeOH/CH2Cl2 to 2percent MeOH/CH2Cl2 with 1percent NH4OH) gave the product as a light-browiti oil., 75336-86-6

75336-86-6 (R)-2-Methylpiperazine 7330434, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; AMGEN INC.; WO2007/70506; (2007); A2;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

163765-44-4, (R)-1-Boc-3-Methylpiperazine is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

The compound (R) -3- methyl-piperazine-1-carboxylate (500mg, 2.5mmol), isobutyric acid (263mg, 3.0mmol),1- ethyl 3- (3-dimethylaminopropyl) carbodiimide hydrochloride (957mg, 5.0mmol) and N- hydroxy-7-azabenzotriazole(507mg, 3.7mmol) It was dissolved in dichloromethane (10 mL), and the conditions under 0 C,to this solution was added dropwise N, N- diisopropylethylamine (1.3mL, 7.49mmol), chamber Temperature for10H, add water (10mL ¡Á 3), dried over anhydrous Na 2 SO 4 organic phase was dried, the solvent was removedconcentrate was separated by column chromatography (developing Degreasing agent: Petroleumether / EtOAc(v / v) = 2/1), to give 670mg white solid: (R) -4- isobutyryl-3- methyl-piperazine-1-carboxylic acid tert Butyl,yield: 99%., 163765-44-4

The synthetic route of 163765-44-4 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Guangdong East Sunshine Pharmaceutical Co., Ltd; Zhang, Ying jun; Liu, Bing; Yu, Tian Zhu; Zhang, Xiang Yu; (348 pag.)CN105399698; (2016); A;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

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

Example 26; 4-{2-[3-(2-Methylsulfanyl-pyrimidin-4-yl)- lH-pyrazolo[3,4-d]pyrimidin-6-ylamino]- ethyl}-piperazine-l-carboxylic acid tert-butyl ester; To a solution of 6-chloro-3-(2-methylsulfanyl-pyrimidin-4-yl)- lH-pyrazolo[3,4- d]pyrimidine (from Example 7 supra) (500 mg, 1.79 mmol) in 2-propanol (40 mL) was added tert-butyl 4-(2-aminoethyl)piperazine- l-carboxylate (613 mg, 1.97 mmol) followed by triethylamine (200 mg, 1.98 mmol). The reaction mixture was stirred at reflux for 15 hours and the solvent was then removed under reduced pressure. The residue was extracted with dichloromethane (3 x 30 mL), washed with water (5 mL), dried over anhydrous sodium sulfate, filtered, and concentrated to afford 4-{2-[3-(2-methylsulfanyl-pyrimidin-4-yl)- lH-pyrazolo[3,4- d]pyrimidin-6-ylamino] -ethyl }-piperazine- l-carboxylic acid tert-butyl ester. (Yield 600 mg, crude). LC-MS: [M+H]+ 472.

192130-34-0, 192130-34-0 tert-Butyl 4-(2-aminoethyl)piperazine-1-carboxylate 1514400, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; F. HOFFMANN-LA ROCHE AG; LIU, Wenjian; LUK, Kin-Chun Thomas; ZHANG, Xiaohu; WO2012/98068; (2012); 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.1228780-72-0,1-((4′-Chloro-5,5-dimethyl-3,4,5,6-tetrahydro-[1,1′-biphenyl]-2-yl)methyl)piperazine,as a common compound, the synthetic route is as follows.

(0142) A mixture of Compound 18A (1.7 g), Compound 3E (1.8 g), and HK2PO4 (1.21 g) in dimethylsulfoxide (20 ml) at 135 C. was stirred for 24 hours. The reaction was cooled, diluted with ether (400 ml), and washed with 3¡Á1M NaOH, and brine, and concentrated. The crude product was chromatographed on silica gel with 10-50% ethyl acetate/hexanes., 1228780-72-0

The synthetic route of 1228780-72-0 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; AbbVie Inc.; Catron, Nathaniel; Lindley, David; Miller, Jonathan M.; Schmitt, Eric A.; Tong, Ping; US10213433; (2019); B2;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

74879-18-8, (S)-(+)-2-Methylpiperazine is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated,74879-18-8

Example 5 (0326) [0227] Compound 154 was prepared according to the reaction scheme in Figures 3 and 4. (0327) [0228] In a first step, compound 40 was prepared from compound 30 as follows: (0328) (0329) 30 40 (0330) [0229] Water (500 g, 5 w/w%) was charged to a reaction flask. Compound 30 (2- methylpiperazine) (100 g, 998.4 mmol, 1 eq.) was charged to the reaction flask with agitation. HC1 (36% aqueous, 102.1 g, 1008 mmol, 1.01 eq.) and methanol (200 g) were charged to the reaction flask with agitation. A solution of Boc20 (222 g, 1008 mmol, 1.01 eq.) in methanol (200 g) was added dropwise to the reaction flask at 15 to 25 C followed by stirring for 18 hours at 20 to 30C. The flask contents were evaporated to dryness in vacuo at 40 to 50C to form a residue. Water (500 g) was added to the residue and the mixture was stirred for 1 hours. The mixture was filtered and the collected solids were washed with water (50 g). The aqueous filtrate was extracted with ethylacetate (500 mL). The extracted aqueous phase was adjusted to a pH in excess of 12 with 30% NaOH and was then extracted with ethylacetate (500 mL) three times. The organic phase was washed with brine (500 g) twice and was then dried with anhydrous Na2S04. The dried mixture was filtered and the collected solids were rinsed with ethylacetate (100 mL). The filtrate was concentrated to dryness in vacuo at 50 to 60C and further concentrated under high vacuum (5 mm Hg) at 65 to 75C for 3 hours to yield compound 40 (tert-butyl 3-methylpiperazine-l-carboxylate). The purity of compound 40 was 97.7 area%, the assay was 95.9% and the yield was 76.4%.

74879-18-8 (S)-(+)-2-Methylpiperazine 2734219, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; F. HOFFMANN-LA ROCHE AG; GENENTECH, INC.; BEAUDRY, Danial; CRAVILLION, Theresa; GOSSELIN, Francis; LIM, Ngiap-Kie; MALHOTRA, Sushant; TIAN, Qingping; ZHANG, Haiming; GMEHLING, Alexander; FETTES, Alec; BACHMANN, Stephan; (130 pag.)WO2018/109050; (2018); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

5271-27-2, 1-Methyl-3-phenylpiperazine is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

General procedure: A mixture of 3 (2.91 g, 10 mmol), 4 (1.76 g, 10 mmol)and KF (18 mmol) were heated at 120-130 ¡ãC in DMF (30mL) for 16 – 18 h. At the end of this period, the reactionmixture was cooled to room temperature and diluted withwater (30 mL). The separated solid was filtered, washed anddried to obtain crude 6a-i. The obtained crude product wasthen purified by recrystallization using ethanol.

5271-27-2, The synthetic route of 5271-27-2 has been constantly updated, and we look forward to future research findings.

Reference£º
Article; Darsi, S.S. Praveen Kumar; Kumar, K. Shiva; Devi, B. Rama; Naidu; Dubey; Letters in Organic Chemistry; vol. 11; 8; (2014); p. 551 – 555;,
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.27561-62-2,Cyclohexyl(piperazin-1-yl)methanone,as a common compound, the synthetic route is as follows.

EXAMPLE 3 4-Amino-2-[4-(cyclohexylcarbonyl)-1-piperazinyl]-6,7-dimethoxyquinazoline N-(Cyclohexylcarbonyl)piperazine (5.9 g., 0.03 mole) and 2-chloro-4-amino-6,7-dimethoxyquinazoline (7.2 g., 0.03 mole) are reacted according to the procedure of Example 1(a). The crude product crystallized from methanol affords analytically pure 4-amino-2-[4-(cyclohexylcarbonyl)-1-piperazinyl]-6,7-dimethoxyquinazoline, m.p. 223-225 C., resolidifying and remelting at 248.0-250.0 C. (corr.) Analysis. Calcd. for C21 H29 N5 O3 (percent): C, 63.14; H, 7.32; N, 17.53. Found (percent): C, 63.07; H, 7.43; N, 17.63., 27561-62-2

27561-62-2 Cyclohexyl(piperazin-1-yl)methanone 3437502, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; Mead Johnson & Company; US4060615; (1977); A;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics