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

HRID 220500Notes

Reaction equation

HRID 220500 reaction equation
[C:1]1([C:7]2[C:8]([N:13]3[CH2:18][CH2:17][NH:16][CH2:15][CH2:14]3)=[N:9][CH:10]=[CH:11][N:12]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH2:19]([N:21]1[C:25]([CH3:26])=[C:24]([CH:27]=O)[CH:23]=[N:22]1)[CH3:20].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(O)(=O)C.[Cl:47]CCCl>>[ClH:47].[CH2:19]([N:21]1[C:25]([CH3:26])=[C:24]([CH2:27][N:16]2[CH2:17][CH2:18][N:13]([C:8]3[C:7]([C:1]4[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=4)=[N:12][CH:11]=[CH:10][N:9]=3)[CH2:14][CH2:15]2)[CH:23]=[N:22]1)[CH3:20]

Participants

6

Reactant 5

HCID 111,2-DichloroethaneHCID 176Acetic AcidHCID 5732041-Ethyl-5-methyl-1H-pyrazole-4-carbaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 595112832-Phenyl-3-(piperazin-1-yl)pyrazine

Product 1

HCID 685949444-(1-Ethyl-5-methyl-1h-pyrazol-4-ylmethyl)-3'-phenyl-3,4,5,6-tetrahydro-2h-[1,2']bipyrazine hydrochlorideYield 52%

Procedure

Dissolve 3′-phenyl-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl (0.28 g, 1.18 mmol) in DCE (5 mL). Add 1-ethyl-5-methyl-1H-pyrazole-4-carbaldehyde (0.24 g, 1.76 mmol) and stir at room temperature for 20 min. Add sodium triacetoxyborohydride (0.5 g, 2.36 mmol) followed by acetic acid (0.07 mL, 1.24 mmol). Stir at room temperature for 16 hr. Purify via SCX chromatography, followed by silica gel chromatography, eluting with 3:97 to 7:93 7 N ammonia in methanol:ethyl acetate, to give the free base of the title compound (0.22 g, 52%). MS (ES): m/z=363.3 [M+H]+.

Workup

  1. customPurify via SCX chromatography
  2. washeluting with 3:97 to 7:93 7 N ammonia in methanol

Sources & evidence

ORD record
ord-0eec44e2033a4e72a02b88ed4d1402c0
Source dataset
uspto-grants-2012_06
Patent number
US08202873B2

Reaction notes

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