Tag: M.W:200-300

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.216144-45-5,4-(4-Methylpiperazin-1-yl)benzylamine,as a common compound, the synthetic route is as follows.

Examples 52 to 79a) The derivatives of Examples 52 to 79 were prepared in parallel synthesis in the following manner:A solution of 100 mg of 2-[(phenoxycarbonyl)amino]-1,3-benzothiazol-6-yl 2,6-dichlorobenzenesulfonate in 1 cm3 of tetrahydrofuran is placed in each tube of a Stem, with stirring. To each tube is added 1 equivalent of amine and 0.279 cm3 of triethylamine in cases 66 and 79; the mixture is then stirred for about 18 hours at a temperature in the region of 20 C. 5 cm3 of dichloromethane and 3 cm3 of aqueous 0.1N sodium hydroxide solution are added to each tube. After stirring for about 2 minutes, the aqueous phase is removed; 3 cm3 of water are added and, after stirring for 2 minutes, the aqueous phase is removed and this operation is repeated. The organic phase is dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residues are purified by flash chromatography on a column of silica and the following compounds are obtained:, 216144-45-5

216144-45-5 4-(4-Methylpiperazin-1-yl)benzylamine 2776493, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; AVENTIS PHARMA S.A.; US2008/194555; (2008); 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.

a) Preparation of Int. 67 The mixture of (3R)-3-(hydroxymethyl)- 1 -piperazinecarboxylic acid, 1 , 1 -dimethylethyl ester (2.41 g; 11.15 mmol), 3- nitro benzylbromide (2.53 g; 11.7mmol) and K2C03(1.34 g; 29 mmol) in ACN (50 ml) was stirred at r.t. for 12 h. The precipitate was filtered off. The filtrate was concentrated in vacuo. The crude was purified by column chromatography (eluent: PE/ EtOAc 4/1). The desired fractions were collected and the solvent was evaporated. Yield: 3.1 g of Int. 67 (88 % yield).

278788-66-2, 278788-66-2 (R)-tert-Butyl 3-(hydroxymethyl)piperazine-1-carboxylate 24820286, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; JANSSEN PHARMACEUTICA NV; DIELS, Gaston, Stanislas, Marcella; SCHOENTJES, Bruno; VERSELE, Matthias, Luc, Aime; BERTHELOT, Didier, Jean-Claude; WILLEMS, Marc; VIELLEVOYE, Marcel; SOMMEN, Francois, Maria; WROBLOWSKI, Berthold; MEERPOEL, Lieven; WO2015/150557; (2015); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

120737-78-2, tert-Butyl 2-methylpiperazine-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 2-methylpiperazine-1-carboxylate (500 mg, 2.50 mmol) in EtOH (20 mL) was added 37% formaldehyde aqueous solution (405 mg) and AcOH (0.02 mL, 0.35 mmol). The mixture was stirred for 2 hand NaBH3CN (315 mg, 5.01 mmol) was added. The resulting solution was stirred at room temperature overnight and concentrated under vacuum. The residue was purified by flash chromatography on silica gel eluting with 4% MeOH in DCM. This resulted in 430 mg (80%) of tert-butyl 2,4-dimethylpiperazine-1-carboxylate as colorless oil. LCMS (Method 25) [M+H]+=215.0, RT=1.45 min., 120737-78-2

As the paragraph descriping shows that 120737-78-2 is playing an increasingly important role.

Reference£º
Patent; Genentech, Inc.; Zak, Mark Edward; Ray, Nicholas Charles; Goodacre, Simon Charles; Mendonca, Rohan; Kellar, Terry; Cheng, Yun-Xing; Li, Wei; Yuen, Po-Wai; US2015/336962; (2015); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

31166-44-6, 1-Cbz-Piperazine is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

EXAMPLE 1 Preparation of 4-Benzoxazol-2-yl-piperazine-1-carboxylic acid benzyl ester A mixture of 2-chlorobenzoxazole (1.00 g, 6.51 mmol), benzyl 1-piperazinecarboxylate (1.43 g, 6.51 mmol), and K2CO3 (1.80 g, 13.0 mmol) in DMF (13 mL) was stirred at 100¡ã C. overnight, cooled, diluted with water, and extracted with EtOAc. The extracts were combined, washed with water and brine, dried over Na2SO4 and concentrated in vacuo to provide the title compound (1.70 g, 77percent), characterized by NMR and mass spectral analyses.

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; Wyeth; US2007/281945; (2007); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

883554-88-9, 4-Carbamoyl-piperazine-1-carboxylic acid tert-butyl ester is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

883554-88-9, The compound 4-carbamoyl-piperazine-1-carboxylate (0.16g, 0.7mmol) was dissolved in dichloromethane(2mL) was added HCl The ethyl acetate solution (4M, 2mL), stirred at rt for 30min, the solvent was removed togive 0.16g of white solid: piperazin-1-carboxamide hydrochloride Salt, yield: 100%.

As the paragraph descriping shows that 883554-88-9 is playing an increasingly important role.

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

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 0.25 M solution of 28 (1.0 eq.) in DMF, secondary amine (1.2 eq.), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (1.2 eq.), and HOBt.H2O (1.2 eq.) were added. The mixture was stirred at room temperature for 16 hours, then poured into water (20 x DMF volume), and extracted with EtOAc (x3). The combined organic layer was washed with brine, and dried over anhydrous Na2SO4. After evaporation, the resulting residue was purified by silica gel chromatography (MeOH/CHCl3) to afford the product.

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

Reference£º
Article; Nakano, Hirofumi; Hasegawa, Tsukasa; Imamura, Riyo; Saito, Nae; Kojima, Hirotatsu; Okabe, Takayoshi; Nagano, Tetsuo; Bioorganic and Medicinal Chemistry Letters; vol. 26; 9; (2016); p. 2370 – 2374;,
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.373608-48-1,tert-Butyl 4-(3-aminopropyl)piperazine-1-carboxylate,as a common compound, the synthetic route is as follows.

EXAMPLE 17[4-(Benzo[b]thiophen-2-yl)-5-methyl-pyrimidin-2-yl]-[3-(piperazin-1-yl)-propyl]-amine; 4-(3-Aminopropyl)-piperazine-1-carboxylic acid tert-butyl ester (261 mg, 1.07 mmol) is added to a stirred suspension of 4-(benzo[b]thiophen-2-yl)-2-chloro-5-methyl-pyrimidine (140 mg, 0.537 mmol) and diisopropylethylamine (140 muL, 0.805 mmol) in anhydrous 1,4-dioxane (3.5 mL) at ambient temperature under nitrogen. The resultant mixture is heated in an oil bath at 95 C. for 36 hours. At ambient temperature the mixture is concentrated and chromatographed on silica gel, eluting with 2 M NH3/CH3OH in dichloromethane 0-6%, to give 4-{3-[4-(benzo[b]thiophen-2-yl)-5-methyl-pyrimidin-2-yl]-amino-propyl}-piperazine-1-carboxylic acid tert-butyl ester as a white solid (178 mg, 70% yield).TFA (1 mL) is added to a stirred solution of the above product (168 mg, 0.359 mmol) and triethylsilane (0.172 mL, 1.08 mmol) in anhydrous 1,2-dichloroethane (3 mL) at ambient temperature under nitrogen. The resultant solution is allowed to stir for 8 hours. After concentration, the crude product is suspended in CH3OH (5 mL)/dichloromethane (3 mL) then treated with 2.5 N lithium hydroxide (LiOH) (0.43 mL) before it is chromatographed on silica gel, eluting with 2 M NH3/CH3OH in dichloromethane 5-20%, to give the title compound as a yellowish solid (132 mg, 100% yield). ES+(m/z) 368 [M+H]., 373608-48-1

The synthetic route of 373608-48-1 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Dahnke, Karl Robert; Lin, Ho-Shen; Richett, Michael Enrico; Shih, Chuan; Wang, Q May; Zhang, Bo; US2008/306082; (2008); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics

122323-88-0, Methyl piperazine-2-carboxylate dihydrochloride is a piperazines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Reference Example 2 A solution of 3,4,5-trimethoxybenzoyl chloride (10.9 g) in dichloromethane (100 ml) is added dropwise taking one hour, under ice-cooling while stirring, to a mixture of methyl piperazine-2-carboxylate dihydrochloride (10.24 g), triethylamine (18.7 g) and dichloromethane (200 ml). The reaction mixture is poured into ice-water, followed by extraction with dichloromethane. The organic layer is washed with water, dried and the solvent is distilled off under reduced pressure. Crystals obtained from the residue are recrystallized from ethyl acetate and hexane to afford methyl 4-(3,4,5-trimethoxybenzoyl)piperazine-2-carboxylate (9.6 g) as colorless needles, m.p. 113-114C., 122323-88-0

122323-88-0 Methyl piperazine-2-carboxylate dihydrochloride 2760425, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; Takeda Chemical Industries, Ltd.; EP368670; (1990); 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.216144-45-5,4-(4-Methylpiperazin-1-yl)benzylamine,as a common compound, the synthetic route is as follows.

Examples 52 to 79a) The derivatives of Examples 52 to 79 were prepared in parallel synthesis in the following manner:A solution of 100 mg of 2-[(phenoxycarbonyl)amino]-1,3-benzothiazol-6-yl 2,6-dichlorobenzenesulfonate in 1 cm3 of tetrahydrofuran is placed in each tube of a Stem, with stirring. To each tube is added 1 equivalent of amine and 0.279 cm3 of triethylamine in cases 66 and 79; the mixture is then stirred for about 18 hours at a temperature in the region of 20 C. 5 cm3 of dichloromethane and 3 cm3 of aqueous 0.1N sodium hydroxide solution are added to each tube. After stirring for about 2 minutes, the aqueous phase is removed; 3 cm3 of water are added and, after stirring for 2 minutes, the aqueous phase is removed and this operation is repeated. The organic phase is dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residues are purified by flash chromatography on a column of silica and the following compounds are obtained:, 216144-45-5

216144-45-5 4-(4-Methylpiperazin-1-yl)benzylamine 2776493, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; AVENTIS PHARMA S.A.; US2008/194555; (2008); 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.

a) Preparation of Int. 67 The mixture of (3R)-3-(hydroxymethyl)- 1 -piperazinecarboxylic acid, 1 , 1 -dimethylethyl ester (2.41 g; 11.15 mmol), 3- nitro benzylbromide (2.53 g; 11.7mmol) and K2C03(1.34 g; 29 mmol) in ACN (50 ml) was stirred at r.t. for 12 h. The precipitate was filtered off. The filtrate was concentrated in vacuo. The crude was purified by column chromatography (eluent: PE/ EtOAc 4/1). The desired fractions were collected and the solvent was evaporated. Yield: 3.1 g of Int. 67 (88 % yield).

278788-66-2, 278788-66-2 (R)-tert-Butyl 3-(hydroxymethyl)piperazine-1-carboxylate 24820286, apiperazines compound, is more and more widely used in various fields.

Reference£º
Patent; JANSSEN PHARMACEUTICA NV; DIELS, Gaston, Stanislas, Marcella; SCHOENTJES, Bruno; VERSELE, Matthias, Luc, Aime; BERTHELOT, Didier, Jean-Claude; WILLEMS, Marc; VIELLEVOYE, Marcel; SOMMEN, Francois, Maria; WROBLOWSKI, Berthold; MEERPOEL, Lieven; WO2015/150557; (2015); A1;,
Piperazine – Wikipedia
Piperazines – an overview | ScienceDirect Topics