Cl.[NH2:2][C@H:3]([C:6]([NH2:8])=[O:7])[CH2:4][OH:5].S=[C:10]1[CH2:14][S:13][C:12](=[O:15])[NH:11]1.C(N(C(C)C)C(C)C)C>C(O)C>[O:15]=[C:12]1[N:11]=[C:10]([NH:2][C@H:3]([C:6]([NH2:8])=[O:7])[CH2:4][OH:5])[CH2:14][S:13]1To a solution of L-serinamide hydrochloride (1.00 g) in ethanol (20 mL) were added 4-thioxo-1,3-thiazolidin-2-one (957 mg) and N-ethyl-N-(1-methylethyl)propan-2-amine (1.88 mL), and the mixture was heated under reflux overnight. The reaction mixture was concentrated under reduced pressure, the residue was purified by silica gel column chromatography (methanol/ethyl acetate), and the obtained powder was washed with ethyl acetate to give the title compound (1.09 g).
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