Water → (R)-(1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(1-methyl-1H-imidazol-2-yl)-(R/S)-methanol

HRID 537239Notes

Reaction equation

HRID 537239 reaction equation
Br[C:2]1[N:3]([CH3:7])[CH:4]=[CH:5][N:6]=1.C([Li])CCC.[F:13][C:14]1[CH:19]=[CH:18][C:17]([N:20]2[C:24]3[CH:25]=[C:26]4[C@:31]([CH:33]=[O:34])([CH2:32][C:23]=3[CH:22]=[N:21]2)[CH2:30][N:29]([S:35]([C:38]2[CH:43]=[CH:42][C:41]([C:44]([F:47])([F:46])[F:45])=[CH:40][CH:39]=2)(=[O:37])=[O:36])[CH2:28][CH2:27]4)=[CH:16][CH:15]=1.O>C(OCC)C>[F:13][C:14]1[CH:19]=[CH:18][C:17]([N:20]2[C:24]3[CH:25]=[C:26]4[C@:31]([CH:33]([C:2]5[N:3]([CH3:7])[CH:4]=[CH:5][N:6]=5)[OH:34])([CH2:32][C:23]=3[CH:22]=[N:21]2)[CH2:30][N:29]([S:35]([C:38]2[CH:39]=[CH:40][C:41]([C:44]([F:47])([F:45])[F:46])=[CH:42][CH:43]=2)(=[O:37])=[O:36])[CH2:28][CH2:27]4)=[CH:16][CH:15]=1

Participants

6

Reactant 4

HCID 962WaterHCID 27732622-Bromo-1-methyl-1H-imidazoleHCID 86709978(R)-1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinoline-4a-carbaldehydeHCID 178418339Butyllithium

Product 1

HCID 89957489(R)-(1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(1-methyl-1H-imidazol-2-yl)-(R/S)-methanolYield 29.1%

Reagents, catalysts & solvents 1

HCID 3283Diethyl EtherSolvent2×

Conditions

Temperature
-75 °C

Procedure

2-Bromo-1-methyl-1H-imidazole (47 μL, 0.48 mmol) was dissolved in diethyl ether (2 mL) and cooled to −75° C. under argon. Butyl lithium (2.5 M in hexanes; 192 μL, 0.48 mmol) was added dropwise and the mixture stirred at −75° C. for 1 hour. A solution of (R)-1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinoline-4a-carbaldehyde (252 mg, 0.5 mmol) in diethyl ether (2 mL) was added dropwise. The reaction mixture was stirred for 16 hours whilst warming slowly to room temperature. The reaction mixture was cooled and treated with water (10 mL) and the phases separated. The organic phase was extracted with further diethyl ether (×2) followed by dichloromethane (×2). The combined organic phases were dried over sodium sulfate, the solids were removed by filtration and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (gradient: 17.5 to 25% acetone in cyclohexane) to afford (R)-(1-(4-fluorophenyl)-6-((4-(trifluoromethyl)phenyl)sulfonyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(1-methyl-1H-imidazol-2-yl)-(R/S)-methanol as a white powder (82 mg) LCMS (Method A, ESI): RT 2.74 min, m+H=588.1

Workup

  1. stirringThe reaction mixture was stirred for 16 hours whilst
  2. temperaturewarming slowly to room temperature
  3. temperatureThe reaction mixture was cooled
  4. customthe phases separated
  5. extractionThe organic phase was extracted with further diethyl ether (×2)
  6. dry with materialThe combined organic phases were dried over sodium sulfate
  7. customthe solids were removed by filtration
  8. concentrationthe filtrate was concentrated under reduced pressure
  9. customThe residue was purified by column chromatography on silica gel (gradient: 17.5 to 25% acetone in cyclohexane)

Sources & evidence

ORD record
ord-761aecaeda384e2abe4ab8984036a167
Source dataset
uspto-grants-2014_10
Patent number
US08859774B2

Reaction notes

Loading…