Sodium hydride → (R)-tert-butyl 4-benzyl-2-isopropyl-3-oxopiperazine-1-carboxylate
Reaktionsgleichung
[C:1]([O:5][C:6](=[O:25])[NH:7][C@H:8]([CH:22]([CH3:24])[CH3:23])[C:9]([N:11]([CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[CH2:12][CH2:13]Cl)=[O:10])([CH3:4])([CH3:3])[CH3:2].[H-].[Na+]>CN(C=O)C>[CH2:15]([N:11]1[CH2:12][CH2:13][N:7]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:25])[C@H:8]([CH:22]([CH3:24])[CH3:23])[C:9]1=[O:10])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
To a solution of (R)-tert-butyl(1-(benzyl(2-chloroethyl)amino)-3-methyl-1-oxobutan-2-yl)carbamate (2.0 g, 5.40 mmol) in DMF (30 mL) was added NaH (1.0 g, 27.0 mmol, 60% in mineral oil) at 0° C. under N2. The mixture was stirred at rt for 2 h. The mixture was quenched with water (20 mL) and extracted with EtOAc (3×20 mL). The combined organic layers were washed with brine (20 mL) and dried over anhydrous Na2SO4, filtered, concentrated and purified by column chromatography to afford (R)-tert-butyl 4-benzyl-2-isopropyl-3-oxopiperazine-1-carboxylate (1.13 g, 63% yield) as a white solid. LC-MS m/z 277.1 [M−56+H]+. 1H NMR (CDCl3 400 MHz): δ 7.38-7.29 (m, 3H), 7.29-7.22 (m, 2H), 5.02-4.86 (m, 1H), 4.49-4.39 (m, 1H), 4.31-4.06 (m, 2H), 3.41-3.18 (m, 3H), 2.42-2.31 (m, 1H), 1.46 (s, 9H), 1.12 (d, J=6.8 Hz, 3H), 1.00 (d, J=6.8 Hz, 3H).