[C:1]([O:5][C:6]([NH:8][C@H:9]([CH3:14])[CH2:10][C:11]([OH:13])=O)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl.CN(C)CCCN=C=NCC.ON1C2C=CC=CC=2N=N1.Cl.[CH3:38][NH:39][O:40][CH3:41]>C(#N)C.C(N(CC)CC)C>[C:1]([O:5][C:6](=[O:7])[NH:8][C@H:9]([CH3:14])[CH2:10][C:11]([N:39]([O:40][CH3:41])[CH3:38])=[O:13])([CH3:2])([CH3:3])[CH3:4]A solution of (3R)-3-[(tert-butoxycarbonyl)amino]butanoic acid (1 g, 5 mmol) in acetonitrile (40 mL) was treated with 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (EDC; 1.05 g, 5.5 mmol), 1-hydroxybenzotriazole (HOBt; 810 mg, 6 mmol), N,O-dimethylhydroxylamine hydrochloride (1.0 g, 10 mmol) and triethylamine (1.4 mL) and stirred at room temperature for 2 d. The solution was evaporated and the residue purified by flash chromatography on a Biotage® system (silica gel, 40-90% ethyl acetate/hexane gradient) to yield the desired product as a colorless viscous oil. MS 269.1 (M+Na).
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