C(=O)([O-])O.[K+].BrC[CH2:8][CH:9]1[CH2:11][CH2:10]1.[C:12]([O:16][C:17](=[O:22])[NH:18][CH2:19][CH2:20][NH2:21])([CH3:15])([CH3:14])[CH3:13]>C1COCC1>[C:12]([O:16][C:17](=[O:22])[NH:18][CH2:19][CH2:20][NH:21][CH2:10][CH:11]1[CH2:8][CH2:9]1)([CH3:15])([CH3:13])[CH3:14]Potassium hydrogen carbonate (220 mg, 2.2 mmol) and (bromoethyl)cyclopropane (270 mg, 2.0 mmol) were added to a solution of tert-butyl-N-(2-aminoethyl)carbamate (320 mg, 2.0 mmol) in THF (10 ml). The mixture was heated at 66° C. for 20 h and solvents were concentrated in vacuo. The residue was dissolved in chloroform, washed with water, dried and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 1% triethylamine:4% methanol:95% chloroform) to yield the title compound (130 mg, 30%).
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