Iodoethane → HCID 69360103, compound

HRID 852595Notes

Reaction equation

HRID 852595 reaction equation
[N+:1]([C:4]1[CH:12]=[C:11]([C:13]([O:15][CH3:16])=[O:14])[CH:10]=[C:9]2[C:5]=1[CH:6]=[N:7][NH:8]2)([O-:3])=[O:2].C([O-])([O-])=O.[K+].[K+].[CH2:23](I)[CH3:24]>CN(C=O)C>[CH2:23]([N:8]1[C:9]2[C:5](=[C:4]([N+:1]([O-:3])=[O:2])[CH:12]=[C:11]([C:13]([O:15][CH3:16])=[O:14])[CH:10]=2)[CH:6]=[N:7]1)[CH3:24]

Participants

5

Reactant 3

HCID 6340IodoethaneHCID 11430Potassium CarbonateHCID 24728064Methyl 4-nitro-1H-indazole-6-carboxylate

Product 1

HCID 69360103HCID 69360103, compoundYield 35%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of methyl 4-nitro-1H-indazole-6-carboxylate (D197) (500 mg, 2.3 mmol, 1 equiv) in DMF (10 ml) at room temperature was added K2CO3 (346 mg, 2.5 mmol, 1.1 equiv) then ethyl iodide (200 μl, 2.5 mmol, 1.1 equiv). The resulting suspension was stirred at room temperature for 15 min then at 40° C. for 30 min, cooled to room temperature and partitioned between AcOEt and a 2N aqueous HCl solution. The two layers were separated and the organic phase dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 2/1) gave methyl 1-ethyl-4-nitro-1H-indazole-6-carboxylate (D198) (200 mg, 35%) as a pale yellow solid. [M+H]+=250.1, RT=3.11 min.

Workup

  1. waitat 40° C. for 30 min
  2. temperaturecooled to room temperature
  3. custompartitioned between AcOEt
  4. customThe two layers were separated
  5. dry with materialthe organic phase dried over MgSO4
  6. concentrationconcentrated in vacuo
  7. customPurification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 2/1)

Sources & evidence

ORD record
ord-d7f4e98fb1a145ca98dee221d8d09439
Source dataset
uspto-grants-2007_08
Patent number
US07253198B2

Reaction notes

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