4-Methoxyphenylhydrazine hydrochloride → 1-[4-Methoxyphenyl]-3-trifluoromethyl-6-[4-iodophenyl]-1,4,5,6-tetrahydropyrazolo-[3,4-c]-pyridin-7-one

HRID 497428Notes

Reaction equation

HRID 497428 reaction equation
[I:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH2:13][CH2:12][CH:11]([C:14](=O)[C:15]([F:18])([F:17])[F:16])[C:10](=O)[C:9]2=[O:21])=[CH:4][CH:3]=1.Cl.[CH3:23][O:24][C:25]1[CH:30]=[CH:29][C:28]([NH:31][NH2:32])=[CH:27][CH:26]=1>Cl.CO>[CH3:23][O:24][C:25]1[CH:30]=[CH:29][C:28]([N:31]2[C:10]3[C:9](=[O:21])[N:8]([C:5]4[CH:6]=[CH:7][C:2]([I:1])=[CH:3][CH:4]=4)[CH2:13][CH2:12][C:11]=3[C:14]([C:15]([F:18])([F:17])[F:16])=[N:32]2)=[CH:27][CH:26]=1

Participants

5

Reactant 2

HCID 27239044-Methoxyphenylhydrazine hydrochlorideHCID 222404772,3-Piperidinedione, 1-(4-iodophenyl)-4-(2,2,2-trifluoroacetyl)-

Product 1

HCID 223185911-[4-Methoxyphenyl]-3-trifluoromethyl-6-[4-iodophenyl]-1,4,5,6-tetrahydropyrazolo-[3,4-c]-pyridin-7-oneYield 74%

Reagents, catalysts & solvents 2

HCID 313Hydrochloric AcidSolventHCID 887MethanolSolvent

Procedure

1-(4-iodophenyl)-4-(trifluoroacetyl)-2,3-piperidinedione from Part C (10.0 g, 24.3 mmol) and 4-methoxyphenylhydrazine hydrochloride (4.28 g, 24.3 mmol) were dissolved in HCl (1N, 200 mL) and methanol (400 mL). The mixture was refluxed overnight. The reaction mixture was cooled to room temperature and quenched with water. It was extracted with ethyl acetate, washed with brine, and dried (Na2SO4). Purification by silica gel chromatography using 0%-100% ethyl acetate/hexane gradient as eluent afforded the desired pyrazole 9.28 g (74%). 1HNMR (CDCl3) δ 7.69 (d, 2H), 7.45 (d, 2H), 7.06 (d, 2H), 6.92 (d, 2H), 4.11 (t, 2H), 3.81 (s, 3H), 3.15 (t, 2H) ppm; Mass Spec (M+H)+514.3.

Workup

  1. temperatureThe mixture was refluxed overnight
  2. customquenched with water
  3. extractionIt was extracted with ethyl acetate
  4. washwashed with brine
  5. dry with materialdried (Na2SO4)
  6. customPurification by silica gel chromatography

Sources & evidence

ORD record
ord-3d7aae0ca5c74524ac35372144a16d2a
Source dataset
uspto-grants-2005_09
Patent number
US06949550B2

Reaction notes

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