Method for preparing racemic selenium-methyl selenocysteine
A methylselenocysteine, racemization technology, applied in chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, organic chemistry, etc., can solve problems such as no reports
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Embodiment 1
[0014] Add 0.3mol of selenium-methylselenocysteine, 400ml of 80% acetic acid aqueous solution, and 0.1mol of salicylaldehyde into a 1000ml three-necked flask equipped with a reflux condenser, heat up to 40°C, stir, and perform a racemization reaction. Optical rotation, until the optical rotation is 0, stop the reaction, evaporate the solvent under reduced pressure to obtain a solid, wash the solid with methanol, filter with suction, and dry under vacuum at room temperature to obtain 53 g of racemic selenium-methylselenocysteine, the yield 97.07%.
Embodiment 2
[0016] Add 0.3mol of selenium-methylselenocysteine, 400ml of 80% acetic acid aqueous solution, and 0.01mol of salicylaldehyde into a 1000ml three-necked flask equipped with a reflux condenser, heat up to 60°C, stir, and perform a racemization reaction. Optical rotation, until the optical rotation is 0, stop the reaction, evaporate the solvent to dryness under reduced pressure to obtain a solid, wash the solid with methanol, filter with suction, and dry under vacuum at room temperature to obtain 52 g of racemic selenium-methylselenocysteine, the yield 95.24%.
Embodiment 3
[0018] Add 0.3mol of selenium-methylselenocysteine, 400ml of 80% acetic acid aqueous solution, and 0.03mol of salicylaldehyde into a 1000ml three-necked flask equipped with a reflux condenser, heat up to 80°C, stir, and carry out a racemization reaction. Optical rotation, until the optical rotation is 0, stop the reaction, evaporate the solvent to dryness under reduced pressure to obtain a solid, wash the solid with methanol, filter with suction, and dry under vacuum at room temperature to obtain 52.4 g of racemic selenium-methylselenocysteine. The rate is 95.97%.
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