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

HRID 58450Notes

Reaction equation

HRID 58450 reaction equation
Cl.[F:2][C:3]1[CH:4]=[CH:5][C:6]([C:15]([F:18])([F:17])[F:16])=[C:7]([CH:9]2[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]2)[CH:8]=1.[C:19]([O:23][C:24]([N:26]1[CH2:31][CH2:30][C:29]2[NH:32][N:33]=[C:34]([C:35](O)=[O:36])[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[CH:4]=[CH:5][C:6]([C:15]([F:18])([F:16])[F:17])=[C:7]([CH:9]2[CH2:10][CH2:11][N:12]([C:35]([C:34]3[C:28]4[CH2:27][N:26]([C:24]([O:23][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:25])[CH2:31][CH2:30][C:29]=4[NH:32][N:33]=3)=[O:36])[CH2:13][CH2:14]2)[CH:8]=1

Participants

8

Reactant 5

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 81531DiisopropylethylamineHCID 509864325-[(tert-butoxy)carbonyl]-1H,4H,5H,6H,7H-pyrazolo[4,3-c]pyridine-3-carboxylic acidHCID 1184833134-(5-Fluoro-2-(trifluoromethyl)phenyl)piperidine Hydrochloride

Product 1

HCID 118483434tert-butyl 3-(4-(5-fluoro-2-(trifluoromethyl)phenyl) piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

Step A To a solution of 4-(5-fluoro-2-trifluoromethyl)phenylpiperidine hydrochloride (11, 90 mg, 0.32 mmol), 5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylic acid (85 mg, 0.32 mmol), and diisopropylethylamine (0.17 mL, 0.96 mmol) in DMF (5.8 mL) was added EDCI (74 mg, 0.38 mmol) and HOBt (52 mg, 0.38 mmol). The resulting solution was stirred at ambient temperature for 24 h. The reaction mixture was diluted with H2O (10 mL) and extracted with EtOAc (3×30 mL). The combined organic extracts were washed with a saturated brine solution (4×20 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 5% MeOH in CH2Cl2 with 0.1% NH4OH in CH2Cl2) to provide tert-butyl 3-(4-(5-fluoro-2-(trifluoromethyl)phenyl) piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate (45) as a white film (120 mg, 80%): 1H NMR (300 MHz, DMSO-d6) δ 12.96 (br s, 1H), 7.76 (dd, J=9.0, 5.7 Hz, 1H), 7.61-7.51 (m, 1H), 7.30-7.18 (m, 1H), 5.34-5.16 (m, 1H), 4.76-4.58 (m, 1H), 4.53-4.38 (m, 2H), 3.65-3.52 (m, 2H), 3.22-3.01 (m, 2H), 2.60-2.43 (m, 3H, overlaps with solvent), 1.83-1.65 (m, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Workup

  1. extractionextracted with EtOAc (3×30 mL)
  2. washThe combined organic extracts were washed with a saturated brine solution (4×20 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 5% MeOH in CH2Cl2 with 0.1% NH4OH in CH2Cl2)

Sources & evidence

ORD record
ord-f9799482692e482593fdf0106c05beac
Source dataset
uspto-grants-2016_09
Patent number
US09434727B2

Reaction notes

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