Method for preparing telmisartan intermediate
A technology for telmisartan and intermediates, which is applied in the field of intermediate synthesis, can solve problems such as the lack of practical significance in synthesis, and achieve the effects of good industrialization prospects, effective recovery and high product purity
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Embodiment 1
[0031] In a 250ml three-necked flask, add 8gNaOH, 13.5ml water, 1.0gTBAB and 11g2-n-propyl-4-methyl-6-(1'-methylbenzimidazol-2'-yl) benzimidazole, 40ml 1 , 2-dichloroethane. A mixture of 9g of 2-cyano-4'-bromomethylbiphenyl and 60ml of 1,2-dichloroethane was added dropwise while stirring under cooling at 0-10°C. After the dropwise addition was completed, the reaction was continued for 5 hours. After the reaction was completed, the layers were separated, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was removed, the residue was washed with 100ml of tertiary methyl ether, washed with water, and dried in an oven to constant weight to obtain 2-cyano-4'-[2"-n-propyl-4"-methyl-6"-( 1'"-methylbenzimidazol-2'"-yl)benzimidazol-1"-ylmethyl]biphenyl, yield 92%, HPLC content 99.6%.
Embodiment 2
[0033] Add 20ml K to a 250ml three-neck flask 2 CO 3 Saturated solution, 0.9g TBAB and 11 grams of 2-n-propyl-4-methyl-6-(1'-methylbenzimidazol-2'-yl)benzimidazole, 40ml of 1,2-dichloroethane. A mixture of 9 g of 2-cyano-4'-bromomethylbiphenyl and 60 ml of 1,2-dichloroethane was added dropwise while stirring under cooling at -10°C-0°C. After the dropwise addition was completed, the reaction was continued for 6 hours. After the reaction was completed, the layers were separated, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was removed, the residue was washed with 100ml of ether and then washed with water, and dried in an oven to constant weight to obtain 2-cyano-4'-[2"-n-propyl-4"-methyl-6"-(1' "-Methylbenzimidazol-2'"-yl)benzimidazol-1"-ylmethyl]biphenyl, yield 87%, HPLC content 99.2%.
Embodiment 3
[0035] In a 250ml three-necked flask, add 8gNaOH, 20ml water, 1.2gTBAHS and 11 grams of 2-n-propyl-4-methyl-6-(1'-methylbenzimidazol-2'-yl)benzimidazole, 40ml carbon tetrachloride. Add dropwise a mixture of 9g of 2-cyano-4'-bromomethylbiphenyl and 60ml of carbon tetrachloride while stirring under cooling at 0-10°C. After the dropwise addition was completed, the reaction was continued for 4 hours. After the reaction was completed, the layers were separated, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was removed, the residue was washed with 100ml of petroleum ether, washed with water, and dried in an oven to constant weight to obtain 2-cyano-4'-[2"-n-propyl-4"-methyl-6"-(1 '"-methylbenzimidazol-2'"-yl)benzimidazol-1"-ylmethyl]biphenyl, yield 90.5%, HPLC content 99.5%.
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