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Sodium hydride → 2-(4-chloro-3-iodo-5-phenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-1-(pyrrolidin-1-yl)ethanone

HRID 1615710
Notes
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Reaction equation

HRID 1615710 reaction equation
[H-].[Na+].[Cl:3][C:4]1[C:9]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)=[N:8][N:7]=[C:6]2[NH:16][N:17]=[C:18]([I:19])[C:5]=12.Cl[CH2:21][C:22]([N:24]1[CH2:28][CH2:27][CH2:26][CH2:25]1)=[O:23].[Li+].[Cl-]>CN(C=O)C.C(OCC)(=O)C>[Cl:3][C:4]1[C:9]([C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=2)=[N:8][N:7]=[C:6]2[N:16]([CH2:21][C:22]([N:24]3[CH2:28][CH2:27][CH2:26][CH2:25]3)=[O:23])[N:17]=[C:18]([I:19])[C:5]=12
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 24758Sodium hydride2×HCID 884401-(Chloroacetyl)pyrrolidineHCID 433294Lithium ChlorideHCID 86717264CID 86717264

Product 1

HCID 867172672-(4-chloro-3-iodo-5-phenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-1-(pyrrolidin-1-yl)ethanoneYield 47%

Reagents, catalysts & solvents 2

HCID 6228
Dimethylformamide
Solvent
HCID 8857Ethyl AcetateSolvent

Procedure

Sodium hydride (60% in mineral oil, 32 mg, 1.75 mmol) was added to a solution of 4-chloro-3-iodo-5-phenyl-1H-pyrazolo[3,4-c]pyridazine (400 mg, 1.12 mmol) and 2-chloro-1-(pyrrolidin-1-yl)ethanone (54 mg, 1.8 mmol) in dry DMF (7.5 mL) at room temperature. After 1.5 h at room temperature further sodium hydride (60% in mineral oil, 27 mg) was added and the suspension stirred for 2 h. 4% LiCl aq. solution and ethyl acetate was added. The layers were separated and the aqueous was extracted with ethyl acetate. The combined organics were dried (MgSO4), filtered and concentrated in vacuo. The residue was partially purified by column chromatography (silica gel, isohexane/ethyl acetate 1:0 to 0:1). The resulting solid was dissolved in minimum CH2Cl2 and diethyl ether was added until a solid precipitated. The solid was collected by filtration to provide 2-(4-chloro-3-iodo-5-phenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-1-(pyrrolidin-1-yl)ethanone (246 mg).

Workup

  1. customThe layers were separated
  2. extractionthe aqueous was extracted with ethyl acetate
  3. dry with materialThe combined organics were dried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customThe residue was partially purified by column chromatography (silica gel, isohexane/ethyl acetate 1:0 to 0:1)
  7. dissolutionThe resulting solid was dissolved in minimum CH2Cl2
  8. additiondiethyl ether was added until a solid
  9. customprecipitated
  10. filtrationThe solid was collected by filtration

Sources & evidence

ORD record
ord-143e5be7127343f6a1deab4d622f4e61
Source dataset
uspto-grants-2014_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08765762B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes