Tag: M.W:200-300

5788-58-9, 4,5-Dibromopyridazin-3(2H)-one is a pyridazine compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

5788-58-9, To a solution of 4,5-dibromo-2,3-dihydropyridazin-3-one (3500 g, 13.78 mol, 1.00 equiv) in DMF (30 L) was added sodium hydride (400 g, 16.56 mol, 1.20 equiv) in batches at 0 C. under nitrogen. The resulting solution was stirred for 1 h at RT followed by addition of [2-(chloromethoxy)ethyl]trimethylsilane (2500 g, 15.2 mol, 1.10 equiv) dropwise at 0 C. The reaction mixture was stirred for 2 h at RT. The reaction was then quenched by the addition of 30 L of water. The resulting solution was extracted with 3¡Á50 L of EtOAc and the organic layers combined. The organic layers were washed with 3¡Á30 L of brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure to afford 4.2 kg of title compound. LCMS: [M+H]+ 384.70.

As the paragraph descriping shows that 5788-58-9 is playing an increasingly important role.

Reference£º
Patent; Ribon Therapeutics Inc.; Vasbinder, Melissa Marie; Schenkel, Laurie B.; Swinger, Kerren Kalai; Kuntz, Kevin Wayne; (410 pag.)US2019/330194; (2019); A1;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

84956-71-8, 2-(tert-Butyl)-4,5-dichloropyridazin-3(2H)-one is a pyridazine compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated,84956-71-8

General procedure: A solution of the substituted pyridazinone and either a benzylic alcohol or benzylic bromide in dimethylformamide was treated with cesium carbonate then optionally heated to 55-80 C. After cooling to ambient temperature, the crude product was isolated as a solution in ethyl acetate, washed with water and aqueous sodium chloride then dried, filtered and concentrated. Subsequent purification by chromatography on silica afforded the title compound.

The synthetic route of 84956-71-8 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Lantheus Medical Imaging, Inc.; Cesati, Richard R.; Radeke, Heike S.; Pandey, Suresh K.; Purohit, Ajay; Robinson, Simon P.; US2015/196672; (2015); A1;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

5788-58-9, 4,5-Dibromopyridazin-3(2H)-one is a pyridazine compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Commercially available 4, 5-dibromopyridazine-3-one (5.05 g, 22.3 mmol) was suspended in phosphorus oxychloride (35 mL), warmed to 90 C, and stirred for 3 h. Most of the phosphorus oxychloride was distilled off at 90 C under reduced pressure. The residue was taken up in DCM and poured into ice. Saturated NAHCO3 solution, followed by 3 N NAOH solution was added untill the pH WAS-9. The resulting mixture was extracted twice with DCM. The combined organic layers were washed with saturated NAHC03 solution then brine. The organic layer was then dried over anhydrous MgS04, filtered, and concentrated to give 5.03 g of product. ESI-MS calc. for C4HBR2CIN2 : 270; Found: 271 (M+H).

5788-58-9, As the paragraph descriping shows that 5788-58-9 is playing an increasingly important role.

Reference£º
Patent; MERCK & CO., INC.; WO2004/41777; (2004); A2;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.10344-42-0,4-Bromo-3,6-dichloropyridazine,as a common compound, the synthetic route is as follows.

c 3,6-Dichloro-4-(pyrrolidin-1-yl)pyridazine To a slurry of 4-bromo-3,6-dichloropyridazine (115 g, 0.51 mol) and potassium carbonate (209 g, 1.5 mol) in DMF (1) was added pyrrolidine (46 ml, 0.56 mol) at 0 C. with stirring. The mixture was allowed to warm to room temperature and then stirred under nitrogen overnight. Water (1.5) was added and the resultant slurry was filtered. The residue was washed thoroughly with water and diethyl ether, yielding the title compound (110 g, 100%) as a fine white powder. 1H NMR (250 MHz, CDCl3) delta2.03 (4H, m), 3.64 (4H, m), 6.46 (1H, s). MS (ES+) m/e 218 [MH]+, 220 [MR]+.

10344-42-0, The synthetic route of 10344-42-0 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Merck Sharp & Dohme Ltd.; US6699859; (2004); B1;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.187973-60-0,6-Iodopyridazin-3-amine,as a common compound, the synthetic route is as follows.

Example B.26-Iodo-3-methyl-2-(trifluoromethyl)imidazo[1,2-b]pyridazine A mixture of 6-iodopyridazin-3-amine (CAS 187973-60-0; 2 g, 9.05 mmol) and 3- bromo-1,1,1-trifluorobutan-2-one (2.41 g, 11.8 mmol) in ethanol (40 ml) under an argon atmosphere was heated to 85C and stirred for 18 hrs. The brown solution was cooled to r.t. and con25 centrated to leave a brown orange sticky paste which was triturated in a mixture of 10 % aq.Na2CO3 (20 ml) and EtOH (20 ml). The suspension was stirred at r.t. for 30 mm. The product was collected by filtration, washed with H20 and dried., 187973-60-0

187973-60-0 6-Iodopyridazin-3-amine 10867834, apyridazine compound, is more and more widely used in various fields.

Reference£º
Patent; F. HOFFMANN-LA ROCHE AG; HOFFMANN-LA ROCHE INC.; FLOHR, Alexander; GROEBKE ZBINDEN, Katrin; WO2015/113980; (2015); A1;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.187973-60-0,6-Iodopyridazin-3-amine,as a common compound, the synthetic route is as follows.

187973-60-0, General procedure: Method H: to a solution of compound 12a (788 mg, 3.24 mmol)in n-butanol (12 mL) was added compound 3 (717 mg, 3.24 mmol).The mixture was refluxed for 16 h, evaporated to dryness, and theresidue was suspended in CHCl3. The solution was made alkalinewith a 30% ammonium hydroxide solution and extracted withCHCl3. The combined organic layers were dried over MgSO4,filtered, and evaporated under reduced pressure to give the desiredimidazo[1,2-b]pyridazine 13a (1.20 g, 100%) as a brown solid.

As the paragraph descriping shows that 187973-60-0 is playing an increasingly important role.

Reference£º
Article; Moine, Esperance; Dimier-Poisson, Isabelle; Enguehard-Gueiffier, Cecile; Loge, Cedric; Penichon, Melanie; Moire, Nathalie; Delehouze, Claire; Foll-Josselin, Beatrice; Ruchaud, Sandrine; Bach, Stephane; Gueiffier, Alain; Debierre-Grockiego, Francoise; Denevault-Sabourin, Caroline; European Journal of Medicinal Chemistry; vol. 105; (2015); p. 80 – 105;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.135034-10-5,3-Chloro-6-iodopyridazine,as a common compound, the synthetic route is as follows.

Step 5: 3-chloro-6-(1-methyl-1/-/-pyrazol-4-yl)pyridazineWater (253 mL) and THF (842 mL) were put in the reaction balloon. The reagents were added one by one to the stirred reaction mixture: potassium phosphate monohydrate 86,2 g (374 mmol) and BTEAC 2,25g (9,88 mmol). Then 3-chloro-6-iodopyhdazine, 45 g (187,2 mmol) and 1-methyl-4-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2-yl)-1 H-pyrazole, 46,73g(224,6 mmol) were added and finally triphenylphosphine, 1 ,96g (7,49 mmol) and palladiumdiacetate, 420 mg (1 ,87 mmol) were added. The reaction mixture was heated at 65C for 16h . The reaction mixture was allowed to cool to 600C. Then 935 mL water and301 , 5g sodium chloride were added. The mixture was stirred for 15 minutes and allowed to cool to 450C. The phases were separated and the organic layer was washed with a solution of 45 g sodium chloride in 374 mL water. The organic layer was separated and stirred with magnesium sulphate (225 g) and charcoal (4,5 g). The mixture was filtered and evaporated. The evaporation residue was co-evaporated with toluene twice and evaporated further till a final volume of 200 ml. This residue was stirred for 16 h at room temperature. The resulting solids were collected by filtration. The solids were dried at reduced pressure affording 29,7 g of the title compound (152,6 mmol, yield 82%).1 H NMR (600 MHz, CHLOROFORM-c/) delta ppm 4.00 (s, 3 H) 7.46 (d, J=8.69 Hz, 1 H) 7.56 (d, J=9.06 Hz, 1 H) 7.98 (s, 1 H) 8.11 (s, 1 H), 135034-10-5

135034-10-5 3-Chloro-6-iodopyridazine 15418839, apyridazine compound, is more and more widely used in various.

Reference£º
Patent; JANSSEN PHARMACEUTICA NV; WO2008/155378; (2008); A1;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem

17973-86-3, 3,6-Dibromopyridazine is a pyridazine compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Example 21: Preparation of 1-(4-chlorophenylamino)-4-(4-pyridylmethoxy)pyridazine [51.2] Step 1: To a mixture of 3,6- dibromo-pyridazine (500 mg, 2.10mmol, for preparation see Pwdrali et al.; J.Org. Chem.; 23, 1958; 778) and 4-pyridylcarbinol (229 mg. 2.10 mmol) in anhydrous tetrahydronfuran (10 mL) at 0 C under argon was added sodium hydride (302 mg, 12.6 mmol). The reaction mixture was warmed up to RT and then was stirred at 50 C under argon for 6h. After cooled to 0 C, the resultant orange mixture was diluted with ethyl acetate (20 mL) and then excess sodium hydride was quenched by water until no bubble occurred. The organic layer was collected and washed by brine ( 3 x 10 mL) and dried over anhydrous Na2SO4, filtered, and evaporated in vacuo, which afforded 400 mg (1.50 mmol, 71% yield) of 1-bromo-4-(4-pyridylmethoxy)pyridazine as an oil. The crude product was pure enough to carried out next step reaction without further purification. 1H-NMR (MeOH-d4) 8.52-8.54 (m, 2H), 7.80 (d, 1H), 7.52-7.54 (m, 2H), 7.25 (d, 1H), 5.60 (s, 2H); MS LC 266 M+,269 (M+3H)+, cacl. 266; TLC (3:2 v/v ethyl acetate-hexanes) Rf= 0.20., 17973-86-3

The synthetic route of 17973-86-3 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; Bayer Corporation; EP1208096; (2004); B1;,
Pyridazine – Wikipedia
Pyridazine | C4H4N2 – PubChem