1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → tert-butyl 3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate

HRID 58437Notes

Reaction equation

HRID 58437 reaction equation
Cl.[F:2][C:3]1[C:4]([C:15]([F:18])([F:17])[F:16])=[C:5]([CH:9]2[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]2)[CH:6]=[CH:7][CH:8]=1.[C:19]([O:23][C:24]([N:26]1[CH2:31][CH2:30][C:29]2[C:32]([C:35](O)=[O:36])=[N:33][NH:34][C:28]=2[CH2:27]1)=[O:25])([CH3:22])([CH3:21])[CH3:20].C(N(C(C)C)CC)(C)C.CCN=C=NCCCN(C)C.C1C=CC2N(O)N=NC=2C=1>CN(C=O)C.O>[F:2][C:3]1[C:4]([C:15]([F:18])([F:16])[F:17])=[C:5]([CH:9]2[CH2:10][CH2:11][N:12]([C:35]([C:32]3[C:29]4[CH2:30][CH2:31][N:26]([C:24]([O:23][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:25])[CH2:27][C:28]=4[NH:34][N:33]=3)=[O:36])[CH2:13][CH2:14]2)[CH:6]=[CH:7][CH:8]=1

Participants

8

Reactant 5

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 81531DiisopropylethylamineHCID 219528526-Boc-1,4,5,7-tetrahydropyrazolo[3,4-c]pyridine-3-carboxylic acidHCID 1184833904-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine Hydrochloride

Product 1

HCID 118483333tert-butyl 3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylateYield 47.5%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

To a solution of 4-(3-fluoro-2-trifluoromethyl)phenylpiperidine hydrochloride (5, 0.080 g, 0.28 mmol), 6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylic acid (0.098 g, 0.67 mmol), and diisopropylethylamine (0.15 mL, 0.85 mmol) in DMF (5.3 mL) was added EDCI (0.065 mg, 0.34 mmol) and HOBt (46 mg, 0.34 mmol), and the mixture stirred at ambient temperature for 24 h. The mixture was diluted with H2O (30 mL) and extracted with EtOAc (4×30 mL). The combined organic extracts were washed with a saturated brine solution (4×30 mL) and concentrated to dryness under reduced pressure. The obtained residue was chromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 10% CH3OH in CH2Cl2 with 0.1% NH4OH in CH2Cl2) to provide tert-butyl 3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate (29) as a white solid (66 mg, 47%): 1H NMR (300 MHz, DMSO-d6) δ 13.20-12.78 (m, 1H), 7.73-7.59 (m, 1H), 7.46 (d, J=7.2 Hz, 1H), 7.37-7.24 (m, 1H), 4.90-4.60 (m, 2H), 4.53-4.43 (m, 2H), 3.60-3.48 (m, 2H), 3.28-2.98 (m, 2H), 2.85-2.69 (m, 1H), 2.65-2.50 (m, 2H, overlaps with solvent), 1.87-1.56 (m, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Workup

  1. extractionextracted with EtOAc (4×30 mL)
  2. washThe combined organic extracts were washed with a saturated brine solution (4×30 mL)
  3. concentrationconcentrated to dryness under reduced pressure
  4. customThe obtained residue was chromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 10% CH3OH in CH2Cl2 with 0.1% NH4OH in CH2Cl2)

Sources & evidence

ORD record
ord-eb1f4612e3044693a08886d93f3cedab
Source dataset
uspto-grants-2016_09
Patent number
US09434727B2

Reaction notes

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