[H-].[Na+].[NH2:3][C@@H:4]([CH:7]([CH3:9])[CH3:8])[CH2:5][OH:6].Cl[CH2:11][C:12](OCC)=[O:13]>C1(C)C=CC=CC=1>[CH:7]([C@@H:4]1[NH:3][C:12](=[O:13])[CH2:11][O:6][CH2:5]1)([CH3:9])[CH3:8]To an ice-cold, stirred suspension of sodium hydride (2.59 g, 64.8 mmol) in toluene (90 mL) was added dropwise a solution of (S)-2-amino-3-methylbutan-1-ol (3 g, 29.1 mmol) in toluene (60 mL). The reaction was then warmed to room temperature and a solution of ethyl chloroacetate (3.56 g, 29.1 mmol) in toluene (16 mL) was added dropwise. The resulting mixture was heated to reflux for 20 h under nitrogen and then concentrated under vacuum. The residue was purified by flash chromatography to afford 2.8 g of product (MS: (M+H)=144.3).
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