[ClH:1].[NH2:2][C@@H:3]([CH2:9][CH:10]([CH3:12])[CH3:11])[CH:4]([OH:8])[C:5]([OH:7])=[O:6].[CH3:13]O>>[ClH:1].[NH2:2][C@@H:3]([CH2:9][CH:10]([CH3:12])[CH3:11])[CH:4]([OH:8])[C:5]([O:7][CH3:13])=[O:6]Hydrogen chloride was passed into a solution 110 mg of (2RS, 3S)-3-amino-2-hydroxy-5-methylhexanoic acid in 10 ml of methanol under ice-cooling, and the mixture was stirred overnight. The reaction mixture was evaporated to dryness under reduced pressure to obtain 150 mg of methyl (2RS, 3S)-3-amino-2-hydroxy-5-methylhexanoate hydrochloride as a white powder.
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