Potassium Carbonate → 1,1-Dimethylethyl 4-{[2-methyl-5-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate

HRID 43384Notes

Reaction equation

HRID 43384 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([C:8]([F:11])([F:10])[F:9])=[CH:4][C:3]=1[S:12]([N:15]1[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]1)(=[O:14])=[O:13].[C:28](=O)([O-])[O-].[K+].[K+].CB1OB(C)OB(C)O1>O1CCOCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:28][C:2]1[CH:7]=[CH:6][C:5]([C:8]([F:11])([F:10])[F:9])=[CH:4][C:3]=1[S:12]([N:15]1[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]1)(=[O:14])=[O:13]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 574072Trimethylboroxine2×HCID 666496401,1-Dimethylethyl 4-{[2-bromo-5-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate

Product 1

HCID 666493901,1-Dimethylethyl 4-{[2-methyl-5-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylateYield 94%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

1,1-dimethylethyl 4-{[2-bromo-5-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate (may be prepared as described in Description 28) (2.59 g, 5.47 mmol), potassium carbonate (1.513 g, 10.94 mmol) in 1,4-dioxane (80 ml) were stirred for 5 min then trimethylboroxin (1.523 ml, 10.94 mmol) and Pd(PPh3)4 (0.632 g, 0.547 mmol) were added and the reaction mixture heated at 100° C. for 1.5 h. Further trimethylboroxin (0.5 mL) was added and the mixture heated at 100° C. for 30 min before allowing to cool overnight. The mixture was concentrated under vacuum then EtOAc (150 ml) added, washed with 200 ml of water, dried on a phase separation cartridge and evaporated under vacuum. The crude material (3.1 g) was purified via Biotage (40+M silica column) using a gradient EtOAc/1-hex from 10/90 to 30/70. Desired fractions were collected and concentrated under vacuum to give the title compound (2.1 g).

Workup

  1. temperaturethe mixture heated at 100° C. for 30 min
  2. temperatureto cool overnight
  3. concentrationThe mixture was concentrated under vacuum
  4. additionEtOAc (150 ml) added
  5. washwashed with 200 ml of water
  6. customdried on a phase separation cartridge
  7. customevaporated under vacuum
  8. customThe crude material (3.1 g) was purified via Biotage (40+M silica column)
  9. customDesired fractions were collected
  10. concentrationconcentrated under vacuum

Sources & evidence

ORD record
ord-196910411b7c4341a5434f4a79335dab
Source dataset
uspto-grants-2013_09
Patent number
US08536183B2

Reaction notes

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