Trifluoroacetic acid → (4r,7s)-2-(2,4-Difluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one

HRID 1437887Notes

Reaction equation

HRID 1437887 reaction equation
FC(F)(F)C(O)=O.C(OC([NH:15][N:16]([C:30]1[CH:35]=[CH:34][C:33]([F:36])=[CH:32][C:31]=1[F:37])[C:17]([CH:19]1[C:24](=O)[C@:23]2([CH3:29])[C:26]([CH3:28])([CH3:27])[C@H:20]1[CH2:21][CH2:22]2)=[O:18])=O)(C)(C)C>ClCCl>[F:37][C:31]1[CH:32]=[C:33]([F:36])[CH:34]=[CH:35][C:30]=1[N:16]1[C:17](=[O:18])[C:19]2[C@H:20]3[C:26]([CH3:28])([CH3:27])[C@:23]([CH3:29])([CH2:22][CH2:21]3)[C:24]=2[NH:15]1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 57941383n'-(2,4-Difluoro-phenyl)-n'-((1s,4s)-4,7,7-trimethyl-3-oxo-bicyclo[2.2.1]heptane-2-carbonyl)-hydrazinecarboxylic acid tert-butyl ester

Product 1

HCID 57941350(4r,7s)-2-(2,4-Difluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-oneYield 84.5%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

Trifluoroacetic acid (80 mL) was added to a solution of crude N′-(2,4-difluoro-phenyl)-N′-((1S,4S)-4,7,7-trimethyl-3-oxo-bicyclo[2.2.1]heptane-2-carbonyl)-hydrazinecarboxylic acid tert-butyl ester (˜100 mmol) in dichloromethane (80 mL) at 0° C. The reaction mixture was stirred at 0° C. for 15 min, and then at room temperature for 4 h. The solvent was evaporated. The residue was taken up in dichloromethane (500 mL) and washed with water (4×600 mL) adding brine to help separate the layers when necessary. The solution was further washed with brine (250 mL), dried (magnesium sulfate), filtered, and evaporated. The solids were triturated with 10% dichlormethane/hexanes, filtered, washed with 5% dichloromethane/hexanes and then hexanes, stored over a weekend in the freezer, and then dried under high vacuum to give (4R,7S)-2-(2,4-difluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (25.71 g, 84%) as a light brown solid.

Workup

  1. waitat room temperature for 4 h
  2. customThe solvent was evaporated
  3. washwashed with water (4×600 mL)
  4. additionadding brine
  5. customto help separate the layers when necessary
  6. washThe solution was further washed with brine (250 mL)
  7. dry with materialdried (magnesium sulfate)
  8. filtrationfiltered
  9. customevaporated
  10. customThe solids were triturated with 10% dichlormethane/hexanes
  11. filtrationfiltered
  12. washwashed with 5% dichloromethane/hexanes
  13. waithexanes, stored over a weekend in the freezer
  14. customdried under high vacuum

Sources & evidence

ORD record
ord-cafffd75f1434087b96886418701689f
Source dataset
uspto-grants-2009_11
Patent number
US07622492B2

Reaction notes

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