Diisopropylethylamine → 1,1-dimethylethyl (2S)-4-{[2-bromo-4-(trifluoromethyl)phenyl]sulfonyl}-2-methyl-1-piperazinecarboxylate

HRID 2066106Notes

Reaction equation

HRID 2066106 reaction equation
[CH3:1][C@H:2]1[CH2:7][NH:6][CH2:5][CH2:4][N:3]1[C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9].CCN(C(C)C)C(C)C.[Br:24][C:25]1[CH:30]=[C:29]([C:31]([F:34])([F:33])[F:32])[CH:28]=[CH:27][C:26]=1[S:35](Cl)(=[O:37])=[O:36].C([O-])(O)=O.[Na+]>C(Cl)Cl.CCOC(C)=O>[Br:24][C:25]1[CH:30]=[C:29]([C:31]([F:33])([F:32])[F:34])[CH:28]=[CH:27][C:26]=1[S:35]([N:6]1[CH2:5][CH2:4][N:3]([C:8]([O:10][C:11]([CH3:13])([CH3:12])[CH3:14])=[O:9])[C@@H:2]([CH3:1])[CH2:7]1)(=[O:37])=[O:36]

Participants

7

Reactant 4

HCID 81531DiisopropylethylamineHCID 516892Sodium BicarbonateHCID 27786112-Bromo-4-(trifluoromethyl)benzenesulfonyl chlorideHCID 10081508tert-Butyl (2S)-2-methylpiperazine-1-carboxylate

Product 1

HCID 591520681,1-dimethylethyl (2S)-4-{[2-bromo-4-(trifluoromethyl)phenyl]sulfonyl}-2-methyl-1-piperazinecarboxylateYield 80.8%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
0 °C

Procedure

To a solution of 1,1-dimethylethyl (2S)-2-methyl-1-piperazinecarboxylate (1.20 g, 5.99 mmol) and DIPEA (5.45 ml, 31.2 mmol) in dry DCM (60 ml) at 0° C. under Ar was added 2-bromo-4-(trifluoromethyl)benzenesulfonyl chloride (2.04 g, 6.29 mmol) and the resulting clear solution stirred at 0° C. for 2 h. EtOAc (100 ml) and saturated aqueous NaHCO3 (100 ml) were added, the layers separated, then the organic layers washed with 2M aqueous HCl (100 ml) and passed through an hydrophobic frit. The solvent was removed to leave the title compound (2.36 g).

Workup

  1. customthe layers separated
  2. washthe organic layers washed with 2M aqueous HCl (100 ml)
  3. customThe solvent was removed

Sources & evidence

ORD record
ord-63d04c27d9004d0286e43c924e3ec574
Source dataset
uspto-grants-2012_10
Patent number
US08288388B2

Reaction notes

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