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ChemicalBook CAS DataBase List L-Alanine
56-41-7

L-Alanine synthesis

9synthesis methods
Anthrobacter oxydans HAP-1 hyper produces DL-alanine in a nongrowth-associated manner.
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Yield:56-41-7 94.2% ，771-61-9 95.7% ，108-95-2 98.2%

Reaction Conditions:

with sodium hydroxide in methanol;water at 25 - 60; for 4 h;Reagent/catalyst;Temperature;Solvent;

Steps:

1

To a 1000 ml reaction flask was added a mixture of compound I and compound II (27 g, 59 mmol), 20 ml of methanol,100ml water was white suspension. The system was heated to 25 ° C,A solution of sodium hydroxide (7.1 g, 177 mmol) was added and the system was gradually clarified during the dropwise addition,After the drop, the colorless transparent liquid, heated to 60 , continue to stir 4h.Point plate detection of raw materials completely react.Add acetic acid to the system to pH = 7, add 200ml dichloromethane extraction system, drying the methylene chloride layer,The dry solvent was recovered under reduced pressure to give 5 g of L-alanine in a yield of 94.2%.The water layer continued to acid to pH = 5, add 200ml ethyl acetate extraction system, ethyl acetate layer drying, vacuum recovery of dry solvent to obtain pentafluorophenol and phenol 16g, of which 10.5p pentafluorophenol, the yield of 95.7%;Phenol (5.5 g, yield: 98.2%).

References:

CN104844467,2016,B Location in patent:Paragraph 0025-0027

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