Acetic Anhydride → Lacosamide
Reaction equation
[NH2:1][C@H:2]([CH2:13][O:14][CH3:15])[C:3]([NH:5][CH2:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)=[O:4].[C:16](OC(=O)C)(=[O:18])[CH3:17]>[Pd].N1C=CC=CC=1>[CH3:17][C:16]([NH:1][C@@H:2]([C:3]([NH:5][CH2:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)=[O:4])[CH2:13][O:14][CH3:15])=[O:18]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 2
Procedure
The second method describes the process, wherein D-serine is protected with benzyloxycarbonyl chloride to give N-Benzyloxycarbonyl-D-serine of Formula-IV. The compound of Formula-IV on alkylation with methyl iodide in the presence of silver oxide and solvent acetonitrile yields the compound (2R)-methyl 2-(benzyloxycarbonylamino)-3-methoxypropanoate of Formula-V, and which is purified by flash column chromatography using silica gel and methanol-chloroform eluent before the next stage. The compound of Formula-V is hydrolyzed to give (2R)-2-(benzyloxycarbonylamino)-3-methoxypropanoic acid of Formula-VI. The compound of Formula-VI is cooled to −78° C. in tetrahydrofuran and reacted with isobutyl chloroformate in presence of N-methylmorpholine followed by reaction with benzylamine to yield the compound (2R)-benzyl 1-(benzylamino)-3-methoxy-1-oxopropan-2-ylcarbamate of Formula-VII. The compound of Formula-VII on hydrogenation using palladium on carbon gives deprotected compound (2R)-2-amino-N-benzyl-3-methoxy-propanamide of Formula-VIII. The compound of Formula-VIII is acetylated using acetic anhydride in the presence of solvent pyridine to give crude Lacosamide of the Formula-I. The crude compound is purified by flash column chromatography to give pure Lacosamide.
Workup
- customgives
- customto give crude Lacosamide of the Formula-I
- customThe crude compound is purified by flash column chromatography
Sources & evidence
- ORD record
- ord-8bbf770d7a224182bf71158572f29c1a
- Source dataset
- uspto-grants-2015_02
- Patent number
- US08957252B2
Reaction notes
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