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CAS No. : | 152628-02-9 |
Formula : | C19H20N4 |
M.W : | 304.39 |
SMILES Code : | C(CC)C1=NC2=C([NH]1)C(=CC(=C2)C3=NC4=C([N]3C)C=CC=C4)C |
MDL No. : | MFCD03840857 |
InChI Key : | ILXRSCZVHSZGCS-UHFFFAOYSA-N |
Pubchem ID : | 9796488 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H332-H335 |
Precautionary Statements: | P261-P280-P305+P351+P338 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
93% | With methanesulfonic acid; In i-Amyl alcohol; at 130 - 135℃; for 18h; | 1.2 kg of isoamyl alcohol was added to the reaction flask.Add <strong>[152628-03-0]2-n-propyl-4-methyl-6-carboxybenzimidazole</strong> (400 g, 1.83 mol) and stir.Methanesulfonic acid (176 g, 1.83 mol, 1.0 eq) was added and N-methyl-phenylenediamine hydrochloride (360 g, 1.85 mol) was added.The temperature was raised to 130-135 C to reflux and the reaction was carried out for at least 18 hours until no significant moisture was separated. After the reaction is completed, cool to about 70 C,Add 2000 ml of water, stir, adjust the pH to 6~7 with 30% NaOH solution, stir and cool to 20~25 C after completion, and filter to obtain the product, the yield is 93.0%, and the HPLC purity is 99.6%. |
77.4% | 4-Methyl-2-n-propyl-lH-benzimidazole-6-carboxylic acid (50 gms) is suspended in Poly phosphoric acid (300 gms), temperature is raised and maintained for 30 min at 70 - 750C, N-Methyl-o-phenylenediamine dihydrochloride. (45 gms) is added lot wise over 2 hrs and maintained at temperature of 70 - 750C for lhr. The temperature of the reaction mass is raised and maintained for 10 hrs at 130 - 1350C. Mass temperature is cooled to 7O0C, water (600 ml) is added slowly at temperature of 60 - 9O0C. Temperature of the reaction mass is cooled to 3O0C, pH is adjusted to 8.0 - 8.5 with aqueous ammonia solution. EPO <DP n="12"/>Temperature of the reaction mass is raised, maintained at 50- 550C for 1 hr, filter the solid, wet cake is washed with hot water (200 ml) and unload the wet cake. The above wet cake suspended in water (900 ml), temperature is raised and mixed for 1 hr at 50 - 550C. Filtered the solid, washed with hot water (100 ml) and dried the wet cake at temperature of 70 - 750C till constant weight. The above dry material is suspended in methanol (260 ml), and temperature is raised to 45 - 5O0C, charcoal (6.5 gms) is added and mixed for about 30 min. Insolubles are filtered through hyflow bed, washed the bed with hot methanol (60 ml), collect and cooled the filtrate to 250C. Water (160 ml) is added slowly to the filtrate at temperature of 25 - 350C, Mass temperature is raised, maintained for 1 hr at reflux temperature. Reaction mass temperature is cooled, maintained for 2 hrs at 0 - 50C. The solid obtained is filtered, wet cake is washed with methanol (60 ml), the wet cake is dried at temperature of 70 - 750C till becomes constant weight. The dry weight of 4-Methyl-6(l -methyl benzimidazol-2-yl)-2-n-propyl IH- benzimidazole is 54 gms (Yield 77.4%). Water content by KF is 5.85%. | |
With polyphosphoric acid; at 150℃; for 14h; | General procedure: A solution of an appropriate ester (25.01mmol) in methanol (25mL) was added to a solution of NaOH (2.0g) in water (25mL), and the mixture was heated under reflux for 2h. After evaporation of methanol, the pH was adjusted to 4-5 by addition of aqueous citric acid. The precipitated solid was filtered, washed with ethanol and dried to yield carboxylic acid. The resulting compound was dissolved in polyphosphoric acid (10mL) at 150C. N-Methyl-o-phenylenediamine dihydrochloride (3.65g, 18.8mmol) was added to the mixture for 4 times in 4h. After stirring at 150C for 10h, the mixture was cooled and then poured into ice water (30mL). The pH was adjusted to 10 by addition of concentrated ammonia (ice cooling). The precipitated solid was filtered off, dried, and boiled in ethyl acetate (300mL). After cooling, the precipitated solid was filtered off, washed with diethyl ether, and dried to give the product as white solid.4.1.2.3 2-Propyl-4-methyl-6-(1-methylbenzimidazol-2-yl)benzimidazole (8c) [14] 8c was prepared by following the above general procedure. Yield: 60.1%. MP: 193-195 C. 1H NMR (400 MHz, CDCl3) delta: 7.82 (d, 2H), 7.30-7.53 (m, 4H), 3.95 (s, 3H), 2.89 (t, 2H), 2.61 (s, 3H), 1.79 (m, 2H), 0.91 (t, 3H). MS (ESI): [M + H]+ calcd 305.2; found 305.1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
82% | Example 1:Orthophosphoric acid (210 gms) was taken in round bottomed flask and Rho205 (210 gms) was added in portions with vigorous stirring. (Note: Sharp increase in temperature > 200 C). The above mass is allowed to cool to 70 C and 2-n-propyl- 4-methyl-benzimidazole-6-carboxylic acid (70 gms, 0.321 mol) was added slowly. Then N-methylbenzene-l,2-diamine hydrochloride (62.3 gms, 0.321 mol) was added in small portions at same temperature and then the temperature was raised to 125-130 C. After completion, reaction was quenched with ice cold water (1 Lt), adjusted pH of the reaction mixture to 9-10 by the addition of aqueous ammonia solution. Obtained solid was filtered and washed with cold water until the pH of the filtrate becomes neutral. Then the crude solid was washed with hot water until colorless filtrate was observed. The crude solid was boiled in ethyl acetate (700 ml) for 2-3 hrs. The reaction mass was cooled and the suspension was filtered off and dried to yield 2-n-propyl-4-methyl-6-(l-methylbenzimidazol-2-yl)-lH- benzimidazole (V) (80 gms, Yield : 82 %). | |
EXAMPLE 2; PREPARATION OF 2-n-PROPYL-4-METHYL-6-(1 -METHYL BENZAMIDAZOLE- 2-YL) BENZAMIDAZOLE (FORMULA IV); 7 kg of 2-n-propyl-4-methyl-benzimidazole-6-carboxylic acid, obtained in Example 1 , and 6.2 kg of N-methyl-o-phenylenediamine hydrochloride were charged into a reactor containing 21 kg of polyphosphoric acid (PPA) under stirring. Reaction mass was heated to 150-155 C and maintained at the same temperature for 5-6 hours. Reaction completion was confirmed by thin layer chromatography. Cooled the reaction mass to 90-100 C. 70 L of water was added slowly to the reaction mass at below 100 C and then cooled to 60-70 C. Stirred at same temperature for 45-60 minutes and then cooled to 40-45 C. 140 L of water was added to the reaction mass and pH was adjusted to 5.5-6 with 50% aqueous sodium hydroxide solution. Centrifuged the reaction mass and washed the solid with 35 L of water. Charged the wet cake and 70 L of water into a reactor. Reaction mass was heated to 70-80 C and stirred for 30-45 minutes. Cooled the reaction mass to 40- 45 C, centrifuged the solid and washed the cake with 35 L of water. Repeated the above water slurry process one more time, then dried the material at 70-75 C for 5-6 hours. Charged the dry material into a reactor containing 80 L of tetrahydrofuran under stirring. Heated the mass to reflux and stirred for 10 minutes. Cooled the reaction mass to 5-10 C and stirred for 60-90 minutes. Filtered the solid and washed with 9 L of tetrahydrofuran. Dried the material at 70-75 C under vacuum for 4-5 hours to get 5.9 kg of the title compound. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | Example 2; Variant 2; Methanesulphonic acid is heated to about 80 C. At a temperature of 75 C. to 85 C., 2-propyl-4-methyl-1H-benzimidazole-6-carboxylic acid is added. Then at 85 C. to 95 C. N-methyl-o-phenylene-diamine is added.The mixture is heated to110 C. to 130 C. and phosphorus pentoxide is metered in until an internal temperature of not more than 160 C. is reached. Then the mixture is stirred for 3 hours at a maximum temperature of 145 C. It is cooled to <100 C. and water is metered into the reaction mixture. 50% sodium hydroxide solution is added at <100 C. until a pH of less than 3 is obtained.Finally, treatments with charcoal are carried out at <100 C.At a temperature of <80 C. isopropanol is added and the mixture is adjusted with sodium hydroxide solution to a pH between 4.5 and 7. The aqueous phase is separated off. In order to precipitate dimethyl-2'-propyl-2,5'-bi-1H-benzimidazole water is metered in, the contents of the apparatus are cooled to at least 40 C. for technical reasons and the product is isolated.Yield: 78-90% of theoryHPLC purity: >99.5%. | |
Stirring blade, a thermometer, three-neck flask 1L fitted with condenser, 4-methyl--2-n-propyl -1H- benzimidazole-6-carboxylic acid 50.0g (229mmol) and polyphosphoric acid added and stirred and 300 g, heated to around 70 C., the reaction solution obtained was stirred for 30 minutes, added in portions over a period N- methyl -O- phenylenediamine 45.0g of (368mmol) 2 hours It was.After adding the entire amount, stirring for 1 hour at around 70 C., and stirred for 5 h warmed to near yet 130. C..After confirming the disappearance of 4-methyl--2-n-propyl -1H- benzimidazole-6-carboxylic acid by HPLC, was cooled to about 70 C., while maintaining the water 600g The temperature of the reaction solution at 70 to 85 C. It was dropped little by little.After the total amount dropwise, 30 C. and cooled to near, pH of the reaction solution with aqueous ammonia was adjusted to be pH 8.3, after stirring for 1 hour warmed to around 50 C., the solid by vacuum filtration It is filtered off and washed the solid was filtered off with water 200g in the vicinity of 50 , to obtain a wet product of light brown crystals.Stirring blade, a thermometer, three-neck flask 1L fitted with condenser, was added and stirred the wet product of the resulting pale brown crystals and water 900 g, after stirring for 1 hour warmed to around 50 C. , vacuum filtered off the solids by filtration, wash the solid was filtered off with 100g of water around 50 C., the resulting wet product was dried for 15 hours under reduced pressure, a pale crude benzimidazole body as brown crystals to obtain a body 60.3g.The crude product of the benzimidazole body was analyzed by HPLC, the purity was 98.20%, the content of methyl benzimidazole body 0.14%, the content of ethyl benzimidazole body with 0.07% there were. stirring blade, a thermometer, three-necked flask 100mL fitted with a condenser, a mixture of a crude product 5.0g of methanol 12g and water 50g benzimidazole body obtained in Production Example 1 was added after stirring on, the addition of hydrochloric acid 2.1g containing hydrogen chloride 0.78 g (21.4 mmol), stirred for 10 minutes at about 25 C., the solid in the reaction solution was confirmed to be dissolved.Then, was added aqueous ammonia 1.1g containing ammonia 0.28 g (16.5 mmol), precipitation of white crystals was confirmed.After stirring for 1 hour at about 25 C., vacuum filtered through the solid was filtered off, the solid was filtered off with water 5g were washed twice and dried for 12 hours at 60 C. under reduced pressure and the resulting wet biomass, to obtain a benzimidazole body 4.2g (13.9mmol) as white crystals.Recovery rate, which is calculated based on the mass of the crude product of the benzimidazole body was 84.4%.As a result of the benzimidazole body obtained was analyzed by HPLC, the purity was 99.56%, the content of methyl benzimidazole body 0.06%, the content of ethyl benzimidazole body 0.02% met. |
Tags: Telmisartan EP Impurity A | Benzimidazoles | Heterocyclic Building Blocks | 152628-02-9
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