1-(Bromomethyl)-2,4-difluorobenzene → (4s,7r)-2-(2-Chloro-4-fluoro-phenyl)-1-(2,4-difluoro-benzyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one

HRID 1438041Notes

Reaction equation

HRID 1438041 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[N:9]1[C:17](=[O:18])[C:16]2[C@@H:15]3[C:19]([CH3:21])([CH3:20])[C@@:12]([CH3:22])([CH2:13][CH2:14]3)[C:11]=2[NH:10]1.[F:23][C:24]1[CH:31]=[C:30]([F:32])[CH:29]=[CH:28][C:25]=1[CH2:26]Br>[I-].C([N+](CCCC)(CCCC)CCCC)CCC.CN(C)C=O>[Cl:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[N:9]1[C:17](=[O:18])[C:16]2[C@@H:15]3[C:19]([CH3:21])([CH3:20])[C@@:12]([CH3:22])([CH2:13][CH2:14]3)[C:11]=2[N:10]1[CH2:26][C:25]1[CH:28]=[CH:29][C:30]([F:32])=[CH:31][C:24]=1[F:23]

Participants

5

Reactant 2

HCID 902971-(Bromomethyl)-2,4-difluorobenzeneHCID 57941321(4s,7r)-2-(2-Chloro-4-fluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one2×

Product 1

HCID 57941338(4s,7r)-2-(2-Chloro-4-fluoro-phenyl)-1-(2,4-difluoro-benzyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-oneYield 68%

Reagents, catalysts & solvents 2

HCID 67553Tetrabutylammonium IodideCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of (4S,7R)-2-(2-chloro-4-fluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 21; 200 mg, 0.62 mmol), tetrabutylammonium iodide (229 mg, 0.62 mmol) and 2,4-difluorobenzyl bromide (320 μL, 2.5 mmol) in dimethylformamide (4 mL) was heated at 80° C. overnight. The solvent was evaporated and dichloromethane (50 mL) was added. The solution was washed with water (2×20 mL), saturated aqueous sodium thiosulfate (20 mL), and brine (20 mL), dried (magnesium sulfate), filtered, concentrated and purified by chromatography, eluting with 60-70% ethyl acetate/petroleum ether, to give (4S,7R)-2-(2-chloro-4-fluoro-phenyl)-1-(2,4-difluoro-benzyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (182 mg, 68%) as an off-white solid. APCI(+)-MS (M+H) 447.

Workup

  1. customThe solvent was evaporated
  2. additiondichloromethane (50 mL) was added
  3. washThe solution was washed with water (2×20 mL), saturated aqueous sodium thiosulfate (20 mL), and brine (20 mL)
  4. dry with materialdried (magnesium sulfate)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. custompurified by chromatography
  8. washeluting with 60-70% ethyl acetate/petroleum ether

Sources & evidence

ORD record
ord-4fc71fd8b782492a8632d26e59a318a3
Source dataset
uspto-grants-2009_11
Patent number
US07622492B2

Reaction notes

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