1,2-Dichloroethane → 3'-(4-Methoxyphenyl)-4-(1,3,5-trimethyl-1h-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2h-[1,2']bipyrazine hydrochloride

HRID 220520Notes

Reaction equation

HRID 220520 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]2[C:10]([N:15]3[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]3)=[N:11][CH:12]=[CH:13][N:14]=2)=[CH:5][CH:4]=1.[CH3:21][N:22]1[C:26]([CH3:27])=[C:25]([CH:28]=O)[C:24]([CH3:30])=[N:23]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].[Cl:45]CCCl>>[ClH:45].[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]2[C:10]([N:15]3[CH2:20][CH2:19][N:18]([CH2:28][C:25]4[C:24]([CH3:30])=[N:23][N:22]([CH3:21])[C:26]=4[CH3:27])[CH2:17][CH2:16]3)=[N:11][CH:12]=[CH:13][N:14]=2)=[CH:5][CH:4]=1

Participants

5

Reactant 4

HCID 111,2-DichloroethaneHCID 7365151,3,5-trimethyl-1H-pyrazole-4-carboxaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 68595204HCID 68595204, compound

Product 1

HCID 685938033'-(4-Methoxyphenyl)-4-(1,3,5-trimethyl-1h-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2h-[1,2']bipyrazine hydrochlorideYield 58%

Procedure

Couple 3′-(4-methoxyphenyl)-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl (0.103 g, 0.400 mmol) and 1,3,5-trimethyl-1H-pyrazole-4-carbaldehyde (0.0727 g, 0.526 mmol) using sodium triacetoxyborohydride (0.167 g, 0.788 mmol) in DCE (5 mL). Stir at room temperature for 18 hr, and add the reaction mixture to an SCX column. Elute with 2 M ammonia in methanol. Purify by silica gel chromatography, eluting with 0:100 to 20:80 methanol:DCM. Dissolve the residue in methanol and add ammonium chloride (1.3 mL of a 0.2 M solution of ammonium chloride in methanol, 0.26 mmol). Stir overnight, concentrate, add diethyl ether and stir overnight. Isolate the solid product by filtration and vacuum dry overnight to give the title compound (100 mg, 58%). MS (ES): m/z=393 [M+H]+.

Workup

  1. additionadd the reaction mixture to an SCX column
  2. washElute with 2 M ammonia in methanol
  3. customPurify by silica gel chromatography
  4. washeluting with 0:100 to 20:80 methanol
  5. dissolutionDissolve the residue in methanol
  6. additionadd ammonium chloride (1.3 mL of a 0.2 M solution of ammonium chloride in methanol, 0.26 mmol)
  7. stirringStir overnight
  8. concentrationconcentrate
  9. additionadd diethyl ether
  10. stirringstir overnight
  11. customIsolate the solid product
  12. filtrationby filtration and vacuum
  13. customdry overnight

Sources & evidence

ORD record
ord-422b54b8efbd44f88f20aa8d5f3c3baf
Source dataset
uspto-grants-2012_06
Patent number
US08202873B2

Reaction notes

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