Methanol → (R)-(1-(4-fluorophenyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(4-(trifluoromethyl)pyridin-2-yl)methanone

HRID 537262Notes

Reaction equation

HRID 537262 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:12]3[CH:13]=[C:14]4[C@:19]([C:21](=[O:32])[C:22]5[CH:27]=[C:26]([C:28]([F:31])([F:30])[F:29])[CH:25]=[CH:24][N:23]=5)([CH2:20][C:11]=3[CH:10]=[N:9]2)[CH2:18][N:17](C(OC(C)(C)C)=O)[CH2:16][CH2:15]4)=[CH:4][CH:3]=1.O1CCOCC1.CO.ClCCl>Cl>[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:12]3[CH:13]=[C:14]4[C@:19]([C:21]([C:22]5[CH:27]=[C:26]([C:28]([F:31])([F:29])[F:30])[CH:25]=[CH:24][N:23]=5)=[O:32])([CH2:20][C:11]=3[CH:10]=[N:9]2)[CH2:18][NH:17][CH2:16][CH2:15]4)=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 887MethanolHCID 6344DichloromethaneHCID 312751,4-DioxaneHCID 86709996(R)-tert-butyl 1-(4-fluorophenyl)-4a-(4-(trifluoromethyl)picolinoyl)-4a,5,7,8-tetrahydro-1H-pyrazolo[3,4-g]isoquinoline-6(4H)-carboxylate

Product 1

HCID 86709995(R)-(1-(4-fluorophenyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(4-(trifluoromethyl)pyridin-2-yl)methanoneYield 69.1%

Reagents, catalysts & solvents 1

HCID 313Hydrochloric AcidSolvent

Procedure

(R)-tert-butyl 1-(4-fluorophenyl)-4a-(4-(trifluoromethyl)picolinoyl)-4a,5,7,8-tetrahydro-1H-pyrazolo[3,4-g]isoquinoline-6(4H)-carboxylate (2 g, 2.65 mmol) was dissolved in a solution of HCl in dioxane (4M) (13.27 ml, 53.1 mmol) and the reaction mixture was stirred at room temperature for 45 minutes. The solvent was removed in vacuo to give an orange gum. This was treated with a mixture of 10% methanol (containing 1% of ammonia)/dichloromethane until complete dissolution of the gum, then the solvent was removed in vacuo to give an orange solid. The crude product was purified by chromatography on silica gel (gradient: 0-10% methanol (containing 1% of ammonia) in dichloromethane) to give (R)-(1-(4-fluorophenyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(4-(trifluoromethyl)pyridin-2-yl)methanone (810 mg) as a pale orange solid. LCMS (Method F, ES-API): RT 1.41 min, m+H=443.2.

Workup

  1. customThe solvent was removed in vacuo
  2. customto give an orange gum
  3. customthe solvent was removed in vacuo
  4. customto give an orange solid
  5. customThe crude product was purified by chromatography on silica gel (gradient: 0-10% methanol (containing 1% of ammonia) in dichloromethane)

Sources & evidence

ORD record
ord-79481358eee94b46bbf7714b229d0679
Source dataset
uspto-grants-2014_10
Patent number
US08859774B2

Reaction notes

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