tert-Butyl piperazine-1-carboxylate → HCID 89677157, compound
Reaction equation
[CH3:1][C:2]1[C:3]([N:10]2[CH2:15][CH2:14][O:13][CH2:12][CH2:11]2)=[C:4]([CH:7]=[CH:8][CH:9]=1)[CH:5]=O.[N:16]1([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:21][CH2:20][NH:19][CH2:18][CH2:17]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>>[CH3:1][C:2]1[C:3]([N:10]2[CH2:15][CH2:14][O:13][CH2:12][CH2:11]2)=[C:4]([CH2:5][N:19]2[CH2:18][CH2:17][N:16]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:21][CH2:20]2)[CH:7]=[CH:8][CH:9]=1Participants
Procedure
A 100 mL round-bottom flask was charged with 3-methyl-2-(morpholin-4-yl)benzaldehyde (1.34 g, 6.51 mmol, 1.00 equiv), tert-butyl piperazine-1-carboxylate (1.00 g, 5.37 mmol, 0.82 equiv), 1,2-dichloromethane (30 mL). The mixture was stirred at room temperature for 0.5 hour. Sodium triacetoxyborohydride (3.42 g, 16.1 mmol, 2.48 equiv) was added. The resulting solution was stirred for 2 h at room temperature and diluted with 1,2-dichloromethane (30 mL). The resulting solution was washed with H2O (2×30 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3) to provide 0.800 g (34% yield) of tert-butyl 4-[[3-methyl-2-(morpholin-4-yl)phenyl]methyl]piperazine-1-carboxylate as light red oil. LCMS (ESI, m/z): 396 [M+H]+.
Workup
- stirringThe resulting solution was stirred for 2 h at room temperature
- washThe resulting solution was washed with H2O (2×30 mL)
- dry with materialdried over anhydrous sodium sulfate
- filtrationfiltered
- concentrationconcentrated under reduced pressure
- customThe residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3)
Sources & evidence
- ORD record
- ord-dcede3823aaa42449bd8fd05cd4c4dc8
- Source dataset
- uspto-grants-2015_09
- Patent number
- US09133148B2
Reaction notes
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