[CH3:1][N:2]([CH:10]1[CH2:14][CH2:13][NH:12][CH2:11]1)[C:3](=[O:9])[O:4][C:5]([CH3:8])([CH3:7])[CH3:6].C(N(CC)CC)C.Cl[C:23]1[CH:28]=[CH:27][C:26]([N+:29]([O-])=O)=[CH:25][N:24]=1>C1COCC1>[NH2:29][C:26]1[CH:27]=[CH:28][C:23]([N:12]2[CH2:13][CH2:14][CH:10]([N:2]([CH3:1])[C:3](=[O:9])[O:4][C:5]([CH3:8])([CH3:6])[CH3:7])[CH2:11]2)=[N:24][CH:25]=1To a solution of commercially available tert-butyl methyl(pyrrolidin-3-yl)carbamate (1.0 g, 5.0 mmol) in THF (25 mL) was added triethylamine (0.70 mL, 5.0 mmol) and 2-chloro-5-nitropyridine (500 mg, 3.1 mmol) and the reaction mixture was stirred at room temperature for 16 h. The reaction mixture was diluted with a satd. aq. NaHCO3 and extracted with ethyl acetate. The organic layer was dried over sodium sulfate, filtered and the filtrate was concentrated. The residue was purified by chromatography (silica, ethyl acetate/hexanes) to afford the desired product (1.0 g, quant.) as a yellow solid. The solid was dissolved in tetrahydrofuran (50 mL), degassed with nitrogen, charged with catalytic 10 wt. % Pd/C (0.5 g) and the reaction mixture was placed under an atmosphere of hydrogen (1 atm) until the reduction was complete by LCMS analysis. The reaction mixture was filtered over diatomaceous earth and the filtrate was concentrated to provide the desired product (940 mg, 100%) as a red oil. ESI MS m/z 293 [C15H24N4O2+H]+
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