Author: tianli

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.541-59-3,Maleimide,as a common compound, the synthetic route is as follows.

A solution of hydrochloric acid (37percent, 13 mL) in water (5.5 mL) was added to 4-bromoaniline (7.48 g, 43.52 mmol) at r.t. with vigorous stirring and the formed precipitate was allowed to stir for 30 min. The reaction mixture was cooled to 0 ¡ãC and a solution of sodium nitrite (3.30 g, 47.87 mmol) in water (9 mL) was added dropwise. At the end of diazotization, a clear yellow solution was obtained. Maleimide (8.45 g, 87.05 mmol) in acetone (35 mL) was added dropwise at 0 ¡ãC and then the pH of the solution was adjusted to 3-3.5 by adding sodium acetate. CuCl2 (0.88 g, 6.57 mmol) was added to the vigorously stirred mixture. The reaction mixture was stirred at 0 ¡ãC for Ih and overnight at r.t. After completion of the reaction as confirmed by TLC, solvents were removed in vacuo to afford the crude compound, which was purified by column chromatography (silica gel, 4: 6 EtOAc: Pet. ether) to afford the title compound as a yellow solid (5.8 g, 57percent). ESIMS (m/z): 252.3 (M+l)

541-59-3 Maleimide 10935, apyrrolines compound, is more and more widely used in various.

Reference£º
Patent; PANACEA BIOTEC LTD.; JAIN, Rajesh; TREHAN, Sanjay; DAS, Jagattaran; KAUR, Gurmeet; KANWAR, Sandeep; SINGH, Nishan; NANDA, Gurmeet Kaur; MAGADI, Sitaram Kumar; SHARMA, Sudhir Kumar; WO2010/150281; (2010); A2;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

1122-10-7, 3,4-Dibromo-1H-pyrrole-2,5-dione is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Compound (5) was synthesized by substituting bromine of dibromomaleimide (4), and 10% KOH (200 ml) was added to compound (5) (0.71 g, 2 mmol) and refluxed for 30 minutes. Next, the reaction was cooled and acidified with 2N HCl to collect red precipitates. The resulting precipitate was extracted with ethyl acetate (2 x 100 mL) and evaporated in vacuo to give a crudeproduct. The crude product was then chromatographed on silica gel (EtOAc / hexane = 3: 1) 667 mg of To obtain bisindole maleic anhydride (6) in a red powder state (yield: 95%).

The synthetic route of 1122-10-7 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Chungnam National University Industry-Academia Collaboration Foundation; Son, Yeong-a; (10 pag.)KR2016/11409; (2016); A;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.25021-08-3,2-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetic acid,as a common compound, the synthetic route is as follows.

S-{2-[(3-Aminopropyl){(1R)-1-[1-benzyl-4-(2,5-difluorophenyl)-1H-pyrrol-2-yl]-2,2-dimethylpropyl}amino]-2-oxoethyl}-N-[(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetyl]-L-cysteine/trifluoroacetic acid (1:1) Under argon, 7.5 mg (0.05 mmol) of (2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetic acid were initially charged in 1.5 ml of DMF, and 7.5 mg (0.05 mmol) of HOBt, 15.5 mg (0.05 mmol) of TBTU and 6.2 mg (0.05 mmol) of N,N-diisopropylethylamine were added. The reaction mixture was stirred at RT for 10 min. 40.0 mg (0.05 mmol) of S-(11-{(1R)-1-[1-benzyl-4-(2,5-difluorophenyl)-1H-pyrrol-2-yl]-2,2-dimethylpropyl}-2,2-dimethyl-6,12-dioxo-5-oxa-7,11-diaza-2-silatridecan-13-yl)-L-cysteine/trifluoroacetic acid (1:1) (Intermediate C71), dissolved in 1.5 ml of DMF, and 18.7 mg (0.14 mmol) of N,N-diisopropylethylamine were then added, and the reaction mixture was stirred at RT overnight. The reaction mixture was purified directly by preparative RP-HPLC (column: Reprosil 250*30; 10mu, flow rate: 50 ml/min, MeCN/water, 0.1% TFA). The solvents were evaporated under reduced pressure and the residue was dried under high vacuum. This gave 11.2 mg (25% of theory) of the compound S-(11-{(1R)-1-[1-benzyl-4-(2,5-difluorophenyl)-1H-pyrrol-2-yl]-2,2-dimethylpropyl}-2,2-dimethyl-6,12-dioxo-5-oxa-7,11-diaza-2-silatridecan-13-yl)-N-[(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetyl]-L-cysteine. LC-MS (Method 1): Rt=1.37 min; MS (ESIpos): m/z=854 (M+H)+.

The synthetic route of 25021-08-3 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; BAYER PHARMA AKTIENGESELLSCHAFT; LERCHEN, Hans-Georg; REBSTOCK, Anne-Sophie; MARX, Leo; JOHANNES, Sarah Anna Liesa; STELTE-LUDWIG, Beatrix; DIETZ, Lisa; TERJUNG, Carsten; MAHLERT, Christoph; GREVEN, Simone; SOMMER, Anette; BERNDT, Sandra; (481 pag.)US2019/77752; (2019); A1;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

872-32-2, 2-Methyl-1-pyrroline is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

General procedure: Acyl chloride (1.2 mmol, 1.2 equiv) was added to a solution of 4-dimethylaminopyridine (DMAP) (1.2 mmol, 1.2 equiv) in acetonitrile (1.0 mL) at 0 ¡ãC. The reaction was stirred at room temperature for 15 min. A solution of the 5-methyl-3,4-dihydro-2H-pyrrole (1.0 mmol) in acetonitrile (1.0 mL) was added and the reaction was stirred at room temperature for 3 h. p-Toluenesulfonic acid monohydrate (3.0 mmol, 3.0 equiv) was added at 0 ¡ãC under inert atmosphere. The reaction was then stirred at room temperature for 2 h. Arylhydrazine (1.5 mmol, 1.5 equiv) was added and stirred for an addition 5 min at room temperature. The reaction was then heated to 82 ¡ãC for 20 h. The reaction cools down to room temperature. The residue was then dissolved in ethyl acetate and washed with brine and a saturated aqueous solution of NaHCO3. The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated in vacuo to give a crude solid, which was purified by column chromatography on silica gel.

As the paragraph descriping shows that 872-32-2 is playing an increasingly important role.

Reference£º
Article; Yeo, Se Jeong; Liu, Yongxiang; Wang, Xiang; Tetrahedron; vol. 68; 3; (2012); p. 813 – 818;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.1334177-86-4,1-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)-3-oxo-7,10,13,16,19,22,25,28-octaoxa-4-azahentriacontan-31-oic acid,as a common compound, the synthetic route is as follows.

EDCI hydrochloride (8 mg, 0.042 mmol) was added to a suspension of Maleimide-PEG8-acid (25 mg, 0.042 mmol) in dry CH2CI2 (4 mL) under argon atmosphere. PBD 85 (42 mg, crude) was added straight away and stirring was maintained until the reaction was complete (3 hours). The reaction was diluted with CH2CI2 and the organic phase was washed with H20 and brine before being dried over MgSO4, filtered and excess solvent removed by rotary evaporation under reduced pressure by rotary evaporation under reduced pressure. The product was purified by careful silica gel chromatography (slow elution starting with 100% CHCI3 up to 9:1 CHCI3/MeOH) followed by reverse phase HPLC to remove unreacted maleimide-PEG8-acid. The product 86 was isolated in 10% over two steps (6.6 mg). LC/MS 1.16 mm (ES+) m/z(relative intensity) 770.20 ([M+ 2H], 40%).

1334177-86-4 1-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)-3-oxo-7,10,13,16,19,22,25,28-octaoxa-4-azahentriacontan-31-oic acid 51340955, apyrrolines compound, is more and more widely used in various.

Reference£º
Patent; VAN BERKEL, Patricius Hendrikus Cornelis; HOWARD, Philip Wilson; (290 pag.)WO2016/166299; (2016); A1;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

134272-64-3, N-(2-Aminoethyl)maleimide Hydrochloride is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

(0439) To a solution of NHS ester, 4a (5 mg, 4.82 mumol) and 1-(2-aminoethyl)-1H-pyrrole-2,5-dione hydrochloride (1.7 mg, 9.64 mumol) in anhydrous dichloromethane (200 muL) was added DIPEA (1.512 muL, 8.68 mumol) under nitrogen. The mixture was stirred at room temperature for 4 hours and then concentrated in vacuo. The resulting residue was purified by RP-HPLC (C18, CH3CN/H2O). Fractions containing desired product were frozen and lyophilized to give maleimide, compound D4 (3.5 mg, 68% yield). LCMS=4.61 min (15 min method). MS (m/z): 1062.8 (M+1)+.

134272-64-3 N-(2-Aminoethyl)maleimide Hydrochloride 22118207, apyrrolines compound, is more and more widely used in various.

Reference£º
Patent; IMMUNOGEN, INC.; Hilderbrand, Scott A.; Hutchins, Benjamin M.; (94 pag.)US2018/208562; (2018); A1;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

25021-08-3, 2-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetic acid is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

N-[(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetyl]-L-valyl-N-[(2S)-4-[{(1R)-1-[1-benzyl-4-(2,5-difluorophenyl)-1H-pyrrol-2-yl]-2,2-dimethylpropyl}(glycoloyl)amino]-1-{[2-(L-gamma-glutamylamino)ethyl]amino}-1-oxobutan-2-yl]-L-alaninamide-trifluoroacetic acid (1:1) The title compound was prepared from intermediate C103 by coupling with N-[(benzyloxy)carbonyl]-L-valyl-L-alanine in the presence of HATU and N,N-diisopropylethylamine. In the next step, the Z protecting group was removed by hydrogenation for one hour over 10% palladium on active carbon in DCM/methanol 1:1 at RT under standard hydrogen pressure. The deprotected intermediate was subsequently converted to the title compound by coupling with (2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)acetic acid in the presence of HATU and N,N-diisopropylethylamine and finally by deprotection using zinc chloride and purification by preparative HPLC. LC-MS (Method 1): Rt=0.9 min; MS (ESIpos): m/z=992 (M+H)+.

As the paragraph descriping shows that 25021-08-3 is playing an increasingly important role.

Reference£º
Patent; BAYER PHARMA AKTIENGESELLSCHAFT; LERCHEN, Hans-Georg; REBSTOCK, Anne-Sophie; CANCHO GRANDE, Yolanda; WITTROCK, Sven; BERNDT, Sandra; GRITZAN, Uwe; FITTING, Jenny; STELTE-LUDWIG, Beatrix; JONES, Patrick; MAHLERT, Christoph; VOTSMEIER, Christian; SCHOeNFELD, Dorian; TRAUTWEIN, Mark; WEBER, Ernst; PAWLOWSKI, Nikolaus; GREVEN, Simone; GLUeCK, Julian Marius; HAMMER, Stefanie; DIETZ, Lisa; MAeRSCH, Stephan; (357 pag.)US2020/138970; (2020); A1;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

872-32-2, 2-Methyl-1-pyrroline is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

At 55 – 60 ¡ãC with vigorous stirring to a mixture of NCS (107 g, 800 mmol) in THF (250 mL) in a 2 L flask was added 5-methyl-3,4-dihydro-2H-pyrrole (8.3 g, 100 mmol) in one- portion. After addition, the reaction spontaneously heated to reflux for about 5 min, then reacted at 60 – 70 ¡ãC for another 1.5 hours. After cooled to r.t., hexane (300 mL) and water (300 mL) were added to the mixture. The organic layer was separated, collected and concentrated. The residue was used in the next step without further purification.

As the paragraph descriping shows that 872-32-2 is playing an increasingly important role.

Reference£º
Patent; HUTCHISON MEDIPHARMA LIMITED; SU, Wei-guo; DAI, Guangxiu; XIAO, Kun; JIA, Hong; ZHANG, Zhulin; VENABLE, Jennifer Diane; BEMBENEK, Scott Damian; CHAI, Wenying; WO2014/15830; (2014); A1;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

872-32-2, 2-Methyl-1-pyrroline is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

General procedure: Acyl chloride (1.2 mmol, 1.2 equiv) was added to a solution of 4-dimethylaminopyridine (DMAP) (1.2 mmol, 1.2 equiv) in acetonitrile (1.0 mL) at 0 ¡ãC. The reaction was stirred at room temperature for 15 min. A solution of the 5-methyl-3,4-dihydro-2H-pyrrole (1.0 mmol) in acetonitrile (1.0 mL) was added and the reaction was stirred at room temperature for 3 h. p-Toluenesulfonic acid monohydrate (3.0 mmol, 3.0 equiv) was added at 0 ¡ãC under inert atmosphere. The reaction was then stirred at room temperature for 2 h. Arylhydrazine (1.5 mmol, 1.5 equiv) was added and stirred for an addition 5 min at room temperature. The reaction was then heated to 82 ¡ãC for 20 h. The reaction cools down to room temperature. The residue was then dissolved in ethyl acetate and washed with brine and a saturated aqueous solution of NaHCO3. The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated in vacuo to give a crude solid, which was purified by column chromatography on silica gel.

The synthetic route of 872-32-2 has been constantly updated, and we look forward to future research findings.

Reference£º
Article; Yeo, Se Jeong; Liu, Yongxiang; Wang, Xiang; Tetrahedron; vol. 68; 3; (2012); p. 813 – 818;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem

55750-48-6, Methyl 2,5-dioxo-2,5-dihydro-1H-pyrrole-1-carboxylate is a pyrrolines compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Compound 10 (CAS Reg. No. 73259-81-1, available from Chem-Impex, 50.0 mg, 0.245 mmol) was dissolved in 2 mL saturated sodium bicarbonate solution at RT. Compound 9 (CAS Reg. No. 55750-48-6, available from Sigma-Aldridge, 38.0 mg, 0.245 mmol) was added at 5 C. It took about 10 min for the suspension to become homogeneous and the reaction vessel was left in a freezer overnight. The mixture was acidified with 10% TFA and purified by preparative chromatography to give compound 7 (25.0 mg, 0.088 mmol, 35.9% yield) as a mixture of rotamers. MS: (+) m/z, 284.9 (M+l). For the major rotamer: NMR (400 MHz, METHANOL-di) delta ppm 1.38 (s, 9 H), 3.56 – 3.66 (m, 1 H), 3.69 – 3.80 (m, 1 H), 4.80 (dd, (0142) J=10.4, 4.3 Hz, 1 H), 6.87 (s, 2 H). Preparative chromatography conditions: Column: XBridge BEH Shield RP18 OBD Prep Column, 13thetaAlpha, 5 muiotaeta, 30 mm X 150 mm, 1/pkg [186002990], flow rate: 40 mL /min, 23 min gradient: 5-50%, acetonitrile (with 0.1% TFA)/ water (with 0.1% TFA). Fractions were collected at 20% acetonitrile in water.

The synthetic route of 55750-48-6 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; BRISTOL-MYERS SQUIBB COMPANY; CONG, Qiang; GANGWAR, Sanjeev; RANGAN, Vangipuram S.; SUNG, Mei-Chen; (36 pag.)WO2017/196598; (2017); A1;,
Pyrroline – Wikipedia
1-Pyrroline | C4H7N – PubChem