Pyridine → 5-(4-Fluorobenzoyl)-4,5,6,7-tetrahydro-2-(phenoxymethyl)-pyrazolo[1,5-a]pyrazine

HRID 2369591Notes

Reaction equation

HRID 2369591 reaction equation
[F:1][C:2]1[CH:10]=[CH:9][C:5]([C:6](Cl)=[O:7])=[CH:4][CH:3]=1.[O:11]([CH2:18][C:19]1[CH:27]=[C:22]2[CH2:23][NH:24][CH2:25][CH2:26][N:21]2[N:20]=1)[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.N1C=CC=CC=1>C(Cl)Cl.C([O-])([O-])=O.[Na+].[Na+]>[F:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([N:24]2[CH2:25][CH2:26][N:21]3[N:20]=[C:19]([CH2:18][O:11][C:12]4[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=4)[CH:27]=[C:22]3[CH2:23]2)=[O:7])=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 1049PyridineHCID 678794-Fluorobenzoyl chlorideHCID 679582494,5,6,7-Tetrahydro-2-(phenoxymethyl)-pyrazolo[1,5-a]pyrazine

Product 1

HCID 679583635-(4-Fluorobenzoyl)-4,5,6,7-tetrahydro-2-(phenoxymethyl)-pyrazolo[1,5-a]pyrazineYield 59.8%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 10340Sodium CarbonateSolvent

Procedure

4-Fluorobenzoyl chloride (0.14 mL, 1.2 mmol) was added to a stirred solution of 4,5,6,7-tetrahydro-2-(phenoxymethyl)-pyrazolo[1,5-a]pyrazine (0.3 g, 1.0 mmol) and pyridine (0.16 mL, 2.0 mmol) in DCM (13 mL) under N2 at 0° C. The reaction was stirred at room temperature for 1 hour, diluted with a saturated solution of Na2CO3 and extracted with DCM. The organic layer was separated, dried (Na2SO4), filtered and the solvents evaporated in vacuo. The crude product was purified by flash column chromatography (silica; AcOEt in DCM 0/100 to 50/50). The desired fractions were collected and the solvents evaporated in vacuo. The desired product was triturated with DIPE to yield 5-(4-fluorobenzoyl)-4,5,6,7-tetrahydro-2-(phenoxymethyl)-pyrazolo[1,5-a]pyrazine (0.21 g, 59% yield) as a white solid. C20H18FN3O2 1H NMR (500 MHz, CDCl3) δ ppm 4.07 (br. s., 2H), 4.27 (br. s., 2H), 4.81 (br. s., 2H), 5.05 (s, 2H), 6.16 (br. s., 1H), 6.96 (dd, J=7.5, 7.2 Hz, 1H), 6.99 (d, J=8.4 Hz, 2H), 7.15 (t, J=8.5 Hz, 2H), 7.29 (dd, J=8.1, 7.8 Hz, 2H), 7.49 (dd, J=8.5, 5.3 Hz, 2H).

Workup

  1. extractionextracted with DCM
  2. customThe organic layer was separated
  3. dry with materialdried (Na2SO4)
  4. filtrationfiltered
  5. customthe solvents evaporated in vacuo
  6. customThe crude product was purified by flash column chromatography (silica; AcOEt in DCM 0/100 to 50/50)
  7. customThe desired fractions were collected
  8. customthe solvents evaporated in vacuo
  9. customThe desired product was triturated with DIPE

Sources & evidence

ORD record
ord-3af76b94ae6b4dfc8893c1103c0f6338
Source dataset
uspto-grants-2014_04
Patent number
US08703946B2

Reaction notes

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