L-Alanine → HCID 10063562, compound

Participants

Reaction Conditions

Reaction Steps

L-alanine (1.50 g, 16.84 mmol) and 2,5-dimethylbenzenesulfonic acid (2,5-DMBS) (3.76 g, 20.20 mmol) were added to ethanol (15 ml), and the mixture was heated overnight at 70° C. to perform esterification. To complete the esterification reaction, the mixture was heated to 90° C., and ethanol (200 ml) was added over 3.5 hours, while distilling away almost the same amount of ethanol. Thereafter, the solvent was evaporated under reduced pressure, and the residue was dried under reduced pressure. The obtained oily residue was cooled in a refrigerator to allow partial crystallization. Ethyl acetate (7 ml) was added, and the residue was dissolved almost entirely at 50° C. The mixture was stirred at room temperature, diethyl ether (40 ml) was further added, and the mixture was stirred at room temperature to give a slurry. The obtained slurry was cooled overnight in a refrigerator, and the crystals were separated and dried to give 3.77 g of L-alanine ethyl ester 2,5-dimethylbenzenesulfonate (L-Ala-OEt 2,5-DMBS salt) dry crystals (L-Ala-OEt 2,5-DMBS salt content 95.6%,11.88 mmol, yield 70.5%).

Provenance & Evidence