A kind of preparation method of n-p-aminobenzoyl-l-glutamic acid
A technology of p-aminobenzoyl and p-nitrobenzoic acid, applied in the field of preparation of N-p-aminobenzoyl-L-glutamic acid, which can solve the inconvenience of industrial production, unsatisfactory yield, long reaction time, etc. problems, to achieve the effect of easy operation, mild reaction and mild reaction conditions
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Embodiment 1
[0025] (1) Preparation of ethylene dichloride solution of p-nitrobenzoyl chloride
[0026] Add 16.71g (0.1mol) of p-nitrobenzoic acid, 67g of dichloroethane, and 0.29g (0.004mol) of DMF into a reaction vessel with a tail gas absorption device, raise the temperature to 40°C, and slowly add BTC / C 2 h 4 Cl 2 Solution 15.5ml, dropwise reflux reaction for 1 hour, concentrated under reduced pressure to about 1 / 3 of the original volume, to recover the solvent and remove hydrogen chloride, the residue is 32g of dichloroethane solution of p-nitrobenzoyl chloride, HPLC The purity of the target substance was determined to be 57.81%.
[0027] (2) Preparation of N-p-nitrobenzoyl-L-glutamic acid
[0028] Add 18.73 g (0.11 mol) of sodium glutamate and 75 g of water into the reaction vessel, adjust the pH to 8 with 1 mol / L aqueous sodium hydroxide solution under stirring, and slowly add 28.31 g of the mixture obtained in step (1) dropwise at 0°C. The dichloroethane solution of nitrobenzoy...
Embodiment 2
[0032] (1) Preparation of ethylene dichloride solution of p-nitrobenzoyl chloride
[0033] Add 16.71g (0.1mol) of p-nitrobenzoic acid, 83.6g of solvent dichloroethane, and 0.22g (0.003mol) of DMF into a reaction vessel with a tail gas absorption device, raise the temperature to 42°C, and slowly add BTC / C 2 h 4 Cl 2 Solution 10ml, dropwise reflux reaction for 1.5 hours, concentrated under reduced pressure to about 1 / 3 of the original volume, to recover the solvent and remove hydrogen chloride, the residue is 31.1g of dichloroethane solution of p-nitrobenzoyl chloride, HPLC The purity of the target substance was determined to be 58.56%.
[0034] (2) Preparation of N-p-nitrobenzoyl-L-glutamic acid
[0035] Add 18.73 g (0.11 mol) of sodium glutamate and 75 g of water into the reaction vessel, adjust the pH to 8.5 with 1 mol / L aqueous sodium hydroxide solution under stirring, and slowly add 29.7 g of the mixture obtained in step (1) dropwise at 3°C. The dichloroethane solutio...
Embodiment 3
[0039] (1) Preparation of ethylene dichloride solution of p-nitrobenzoyl chloride
[0040] Add 16.71g (0.1mol) of p-nitrobenzoic acid, 100.3g of dichloroethane, and 0.37g (0.005mol) of DMF into a reaction vessel with a tail gas absorption device, raise the temperature to 45°C, and slowly add BTC / C 2 h 4 Cl 2 Solution 12ml, dropwise reflux reaction for 2 hours, concentrated under reduced pressure to about 1 / 3 of the original volume, to recover the solvent and remove hydrogen chloride, the residue is 32g of dichloroethane solution of p-nitrobenzoyl chloride, determined by HPLC The purity of the target object was 57.23%.
[0041] (2) Preparation of N-p-nitrobenzoyl-L-glutamic acid
[0042] Add 18.73 g (0.11 mol) of sodium glutamate and 75 g of water to the reaction vessel, adjust the pH to 9 with 1 mol / L aqueous sodium hydroxide solution under stirring, and slowly add 29.7 g of the mixture obtained in step (1) dropwise at 5°C. The dichloroethane solution of nitrobenzoyl chlor...
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