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tert-Butyl piperazine-1-carboxylate → (3-((4-(Tert-butoxycarbonyl)piperazin-1-yl)methyl)phenyl)boronic acid

HRID 564509
Notes
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Reaction equation

HRID 564509 reaction equation
[CH:1]([C:3]1[CH:4]=[C:5]([B:9]([OH:11])[OH:10])[CH:6]=[CH:7][CH:8]=1)=O.[N:12]1([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:17][CH2:16][NH:15][CH2:14][CH2:13]1.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>C(Cl)Cl.CCOC(C)=O>[CH3:24][C:21]([O:20][C:18]([N:12]1[CH2:17][CH2:16][N:15]([CH2:1][C:3]2[CH:4]=[C:5]([B:9]([OH:11])[OH:10])[CH:6]=[CH:7][CH:8]=2)[CH2:14][CH2:13]1)=[O:19])([CH3:22])[CH3:23]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 27343563-Formylphenylboronic acidHCID 5049666Sodium triacetoxyborohydride

Product 1

HCID 42609723(3-((4-(Tert-butoxycarbonyl)piperazin-1-yl)methyl)phenyl)boronic acidYield 120.6%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolvent
HCID 8857Ethyl AcetateSolvent

Procedure

To a solution of (3-formylphenyl)boronic acid (3.0 g, 20.0 mmol) in DCM (100 mL) was added 1,1-dimethylethyl 1-piperazinecarboxylate (3.91 g, 21.0 mmol), NaBH(OAc)3 (6.36 g, 30.0 mmol) and this mixture was stirred at room temperature for 17 h. The organic layer was diluted with EtOAc (100 mL), which was washed with H2O (30 mL), then dried over Na2SO4, filtered and concentrated to afford the title compound 7.72 g (quantitative). LC-MS m/z 321 (M+H)+, 1.49 min (ret time).

Workup

  1. washwas washed with H2O (30 mL)
  2. dry with materialdried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-16572614356e4330a72ef4a1fedd5993
Source dataset
uspto-grants-2011_11
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08067408B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes