tert-Butyl piperazine-1-carboxylate → HCID 89676972, compound

HRID 2278201Notes

Reaction equation

HRID 2278201 reaction equation
[Cl:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([N:10]2[CH2:14][CH2:13][CH2:12][CH2:11]2)[C:3]=1[CH:4]=O.[N:15]1([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl>[Cl:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([N:10]2[CH2:14][CH2:13][CH2:12][CH2:11]2)[C:3]=1[CH2:4][N:18]1[CH2:17][CH2:16][N:15]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:20][CH2:19]1

Participants

5

Reactant 3

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 5049666Sodium triacetoxyborohydrideHCID 286035692-Chloro-6-(1-pyrrolidinyl)benzaldehyde

Product 1

HCID 89676972HCID 89676972, compoundYield 84.6%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent2×

Procedure

A 100 mL round-bottom flask was charged with 2-chloro-6-(pyrrolidin-1-yl)benzaldehyde (1.40 g, 6.68 mmol, 1.10 equiv), tert-butyl piperazine-1-carboxylate (1.13 g, 6.07 mmol, 1.00 equiv), 1,2-dichloroethane (20 mL). The mixture was stirred 30 min at room temperature. Sodium triacetoxyborohydride (3.85 g, 18.2 mmol, 2.99 equiv) was added. The resulting solution was stirred overnight at room temperature and diluted with 1,2-dichloroethane (20 mL). The resulting solution washed with H2O (2×20 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 (3/7) to yield 1.95 g (77% yield) of tert-butyl 4-[[2-chloro-6-(pyrrolidin-1-yl)phenyl]methyl]piperazine-1-carboxylate as yellow oil. LCMS (ESI, m/z): 380 [M+H]+.

Workup

  1. stirringThe resulting solution was stirred overnight at room temperature
  2. washThe resulting solution washed with H2O (2×20 mL)
  3. dry with materialdried over anhydrous sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (3/7)

Sources & evidence

ORD record
ord-c2e5676f730f49dfbb250e0ccc5465c5
Source dataset
uspto-grants-2015_09
Patent number
US09133148B2

Reaction notes

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