Benzyl succinimido carbonate → Benzyl 1-(dimethylamino)-2-methylpropan-2-ylcarbamate
反応式
[CH3:1][N:2]([CH3:8])[CH2:3][C:4]([CH3:7])([NH2:6])[CH3:5].[C:9](ON1C(=O)CCC1=O)([O:11][CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[O:10]>C(O)(C)C.O>[CH3:1][N:2]([CH3:8])[CH2:3][C:4]([NH:6][C:9](=[O:10])[O:11][CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)([CH3:7])[CH3:5]参加物
4
実験手順
N1,N1,2-Trimethylpropane-1,2-diamine (5.68 g, 48.8 mmol) was dissolved into isopropanol/water (1:1, 150 mL). To this solution was added CbzOSu (12.2 g, 1 equiv, 48.8 mmol) in one portion. The reaction was left to stir at room temperature overnight for 17 h. The solvent was removed and the residue was taken up in a mixture of ethyl acetate (300 mL) and water (100 mL). The layers were separated and the organic layer extracted with water (2×100 mL). The organic layer was dried over anhydrous MgSO4, filtered and concentrated to an oil. The crude oil was purified on an ISCO purification system with gradient elution from 2% methanol in DCM to 30% methanol in DCM. The desired fraction was collected and concentrated to give a colorless oil (8.95 g, yield: 73.2%). 1H NMR (CDCl3, 400 MHz): δ 1.41 (s, 6H), 2.51 (s, 2H), 2.98 (s, 2 H). LRMS (ESI+) for C14H22N2O2 (250.2); Found: 251 (MH+).