4-Fluorobenzylamine → N-[(4-fluorophenyl)methyl]-3-hydroxy-5-methyl-4-oxo-7-(3-pyridyl)-6,7-dihydropyrazolo[1,5-a]pyrazine-2-carboxamide

HRID 1453875Notes

Reaction equation

HRID 1453875 reaction equation
[OH:1][C:2]1[C:3]([C:19](OC)=[O:20])=[N:4][N:5]2[CH:10]([C:11]3[CH:12]=[N:13][CH:14]=[CH:15][CH:16]=3)[CH2:9][N:8]([CH3:17])[C:7](=[O:18])[C:6]=12.[F:23][C:24]1[CH:31]=[CH:30][C:27]([CH2:28][NH2:29])=[CH:26][CH:25]=1>CO>[F:23][C:24]1[CH:31]=[CH:30][C:27]([CH2:28][NH:29][C:19]([C:3]2[C:2]([OH:1])=[C:6]3[C:7](=[O:18])[N:8]([CH3:17])[CH2:9][CH:10]([C:11]4[CH:12]=[N:13][CH:14]=[CH:15][CH:16]=4)[N:5]3[N:4]=2)=[O:20])=[CH:26][CH:25]=1

Participants

4

Reactant 2

HCID 673264-FluorobenzylamineHCID 68953024Methyl 3-hydroxy-5-methyl-4-oxo-7-pyridin-3-yl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate

Product 1

HCID 54678885N-[(4-fluorophenyl)methyl]-3-hydroxy-5-methyl-4-oxo-7-(3-pyridyl)-6,7-dihydropyrazolo[1,5-a]pyrazine-2-carboxamide

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

Methyl 3-hydroxy-5-methyl-4-oxo-7-pyridin-3-yl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate (40 mg, 0.13 mmol) and 4-fluorobenzylamine (130 mg, 1.06 mmol) were combined in MeOH (0.5 mL) and the mixture was heated to reflux, allowing the solvent to slowly evaporate over 18 hours. The residue was purified by preparative HPLC (Waters Nova Pak column (100×40 mm I.D. cartridge, C18, 6 μM pore size) eluting with 95-5% water (0.1% TFA)/acetonitrile (0.1% TFA) at 35 mL/minute.). The appropriate fractions were combined and the solvent was removed to give the title compound as a gum. 1H NMR (400 MHz, d6-DMSO) δ 8.77 (t, J=6 Hz, 1H), 8.67 (s, 1H), 8.53 (s, 1H), 7.6-7.7 (m, 2H), 7.33 (dd, J=5.7, 8.6 Hz, 2H), 7.13 (t, J=9.0 Hz, 2H), 5.90 (t, J=4.6 Hz, 1H), 4.39 (ABX, J=15, 6.1 Hz, 2H), 4.19 (dd, J=13, 4.6 Hz, 1H), 3.91 (dd, J=13, 4.5 Hz, 1H), 2.91 (s, 3H); ES MS (M+1)=396.

Workup

  1. temperaturethe mixture was heated
  2. temperatureto reflux
  3. customto slowly evaporate over 18 hours
  4. customThe residue was purified by preparative HPLC (Waters Nova Pak column (100×40 mm I.D. cartridge, C18, 6 μM pore size) eluting with 95-5% water (0.1% TFA)/acetonitrile (0.1% TFA) at 35 mL/minute.)
  5. customthe solvent was removed

Sources & evidence

ORD record
ord-9133cd440b784f6996514a2c1305a721
Source dataset
uspto-grants-2009_01
Patent number
US07476666B2

Reaction notes

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