Triethylamine → 3'-chloro-4-(5-methyl-1-phenyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinyl

HRID 220554Notes

Reaction equation

HRID 220554 reaction equation
Cl.Cl.[Cl:3][C:4]1[C:5]([N:10]2[CH2:15][CH2:14][NH:13][CH2:12][CH2:11]2)=[N:6][CH:7]=[CH:8][N:9]=1.[CH3:16][C:17]1[N:21]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)[N:20]=[CH:19][C:18]=1[CH:28]=O.C(N(CC)CC)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl.C(O)(=O)C>[Cl:3][C:4]1[C:5]([N:10]2[CH2:11][CH2:12][N:13]([CH2:28][C:18]3[CH:19]=[N:20][N:21]([C:22]4[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=4)[C:17]=3[CH3:16])[CH2:14][CH2:15]2)=[N:6][CH:7]=[CH:8][N:9]=1

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 27764375-Methyl-1-phenyl-1H-pyrazole-4-carboxaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 866416583'-chloro-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinyl dihydrochloride

Product 1

HCID 866416633'-chloro-4-(5-methyl-1-phenyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinylYield 88%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 176Acetic AcidSolvent

Procedure

Dissolve 3′-chloro-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl dihydrochloride (0.500 g, 1.84 mmol) in 1,2-dichloroethane (19 mL). Add 5-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde (0.396 g, 2.13 mmol), triethylamine (594 μL, 4.26 mmol), sodium triacetoxyborohydride (0.677 g, 3.20 mmol) and acetic acid (200 μL) and stir at room temperature for 18 hr. Add aq. saturated sodium bicarbonate and extract four times with DCM. Dry combined organic layers (magnesium sulfate), filter, concentrate, and purify (silica gel chromatography, eluting with 0:100 to 100:0 ethyl acetate:hexanes) to give 3′-chloro-4-(5-methyl-1-phenyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl (597 mg, 88%) MS (ES): m/z=369[M+H]+.

Workup

  1. extractionAdd aq. saturated sodium bicarbonate and extract four times with DCM
  2. customDry
  3. filtrationfilter
  4. concentrationconcentrate
  5. custompurify
  6. wash(silica gel chromatography, eluting with 0:100 to 100:0 ethyl acetate:hexanes)

Sources & evidence

ORD record
ord-61c365f268f544f988d355334b7c713b
Source dataset
uspto-grants-2012_06
Patent number
US08202873B2

Reaction notes

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