C(OC(=O)[NH:7][C@@H:8]([C:10](=[O:15])[NH:11][CH2:12][CH2:13][OH:14])[CH3:9])(C)(C)C.[F:17][C:18]([F:23])([F:22])[C:19]([OH:21])=[O:20]>ClCCl>[F:17][C:18]([F:23])([F:22])[C:19]([OH:21])=[O:20].[NH2:7][C@H:8]([CH3:9])[C:10]([NH:11][CH2:12][CH2:13][OH:14])=[O:15]In a round-bottomed flask, [(R)-1-(2-hydroxy-ethylcarbamoyl)-ethyl]-carbamic acid tert-butyl ester (180 mg, 0.78 mmol) was dissolved in dichloromethane (5 ml) and trifluoroacetic acid (1.8 ml, 23.4 mmol) was slowly added. The pale yellow reaction mixture was stirred at room temperature for 2 h then concentrated to afford (R)-2-amino-N-(2-hydroxy-ethyl)-propionamide trifluoroacetate as a light yellow oil which was used without further purification.
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