Ethyl iodoacetate → [(4r,7s)-2-(2,4-Difluoro-phenyl)-7,8,8-trimethyl-3-oxo-2,3,4,5,6,7-hexahydro-4,7-methano-indazol-1-yl]-acetic acid ethyl ester

HRID 1438007Notes

Reaction equation

HRID 1438007 reaction equation
[F: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.I[CH2:24][C:25]([O:27][CH2:28][CH3:29])=[O:26]>CN(C)C=O>[CH2:28]([O:27][C:25](=[O:26])[CH2:24][N:10]1[C:11]2[C@:12]3([CH3:22])[C:19]([CH3:21])([CH3:20])[C@@H:15]([CH2:14][CH2:13]3)[C:16]=2[C:17](=[O:18])[N:9]1[C:3]1[CH:4]=[CH:5][C:6]([F:8])=[CH:7][C:2]=1[F:1])[CH3:29]

Participants

4

Reactant 2

HCID 12183Ethyl iodoacetateHCID 57941350(4r,7s)-2-(2,4-Difluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one2×

Product 1

HCID 57941308[(4r,7s)-2-(2,4-Difluoro-phenyl)-7,8,8-trimethyl-3-oxo-2,3,4,5,6,7-hexahydro-4,7-methano-indazol-1-yl]-acetic acid ethyl esterYield 59.4%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of (4R,7S)-2-(2,4-difluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 42; 355 mg, 1.16 mmol) and ethyl iodoacetate (700 μL, 5.91 mmol) in dimethylformamide (5 mL) was heated at 100° C. for 2 h. The solvent was evaporated, dichloromethane (50 mL) was added and the solution was washed with 1:1 water/aqueous sodium thiosulfate (25 mL). The aqueous layer was back-extracted with dichloromethane (2×25 mL) and the combined organic layers were washed with brine (25 mL). The solution was dried (magnesium sulfate), filtered, evaporated, purified using an ISCO 12 g column, eluting with 40-100% ethyl acetate/petroleum ether, and dried under high vacuum at 75° C. to give [(4R,7S)-2-(2,4-difluoro-phenyl)-7,8,8-trimethyl-3-oxo-2,3,4,5,6,7-hexahydro-4,7-methano-indazol-1-yl]-acetic acid ethyl ester (269 mg, 59%) as an off-white solid. ES(+)-MS (M+H) 391.

Workup

  1. customThe solvent was evaporated
  2. additiondichloromethane (50 mL) was added
  3. washthe solution was washed with 1:1 water/aqueous sodium thiosulfate (25 mL)
  4. extractionThe aqueous layer was back-extracted with dichloromethane (2×25 mL)
  5. washthe combined organic layers were washed with brine (25 mL)
  6. dry with materialThe solution was dried (magnesium sulfate)
  7. filtrationfiltered
  8. customevaporated
  9. custompurified
  10. washeluting with 40-100% ethyl acetate/petroleum ether
  11. customdried under high vacuum at 75° C.

Sources & evidence

ORD record
ord-148068abd6994550a4e9e56682bd7f0c
Source dataset
uspto-grants-2009_11
Patent number
US07622492B2

Reaction notes

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