Hydrazine hydrate (1:1) → HCID 67492751, compound

HRID 1922384Notes

Reaction equation

HRID 1922384 reaction equation
[CH3:1][CH:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([N+:11]([O-])=O)[CH:9]=2)[N:4]([CH:14]2[CH2:19][CH2:18][N:17]([CH3:20])[CH2:16][CH2:15]2)[C:3]1=[O:21].O.NN>CO.[Ni]>[NH2:11][C:8]1[CH:9]=[C:10]2[C:5](=[CH:6][CH:7]=1)[N:4]([CH:14]1[CH2:15][CH2:16][N:17]([CH3:20])[CH2:18][CH2:19]1)[C:3](=[O:21])[CH:2]2[CH3:1]

Participants

5

Reactant 2

HCID 24654Hydrazine hydrate (1:1)HCID 67492871HCID 67492871, compound

Product 1

HCID 67492751HCID 67492751, compoundYield 96%

Reagents, catalysts & solvents 2

HCID 935NickelCatalystHCID 887MethanolSolvent

Procedure

A solution of compound 3-methyl-1-(1-methylpiperidin-4-yl)-5-nitroindolin-2-one (0.1 g, 0.345 mmol) in dry methanol (3 mL) was treated with Ra—Ni (0.05 g of wet slurry) followed by hydrazine hydrate (0.1 mL, 3.456 mmol) at room temperature. The resulting mixture was refluxed for 2 min. in a pre-heated oil bath and brought to room temperature. The reaction was filtered through celite bed and washed with methanol (3×10 mL). The combined methanol layer was evaporated and crude was purified by column chromatography (2 M NH3 in MeOH:CH2Cl2, 5:95) to obtain compound 5-amino-3-methyl-1-(1-methylpiperidin-4-yl)indolin-2-one (0.085 g, 96%) as a syrup. 1H NMR (DMSO-d6) δ: 1.24 (d, 3H, J=7.8 Hz), 1.42-1.54 (m, 2H), 1.96 (t, 2H, J=10.2 Hz), 2.18 (s, 3H), 2.26-2.34 (m, 2H), 2.85 (d, 2H, J=11.1 Hz), 3.25-3.30 (m, 1H), 3.91-4.02 (m, 1H), 4.75 (s, 2H), 6.43 (dd, 1H, J=2.1, 8.4 Hz), 6.56 (d, 1H, J=1.5 Hz), 6.79 (d, 1H, J=8.4 Hz); ESI-MS (m/z, %) 260 (MH+, 100).

Workup

  1. temperatureThe resulting mixture was refluxed for 2 min. in a pre-heated oil bath
  2. custombrought to room temperature
  3. filtrationThe reaction was filtered through celite bed
  4. washwashed with methanol (3×10 mL)
  5. customThe combined methanol layer was evaporated
  6. customcrude was purified by column chromatography (2 M NH3 in MeOH:CH2Cl2, 5:95)

Sources & evidence

ORD record
ord-0bc845001d30445ab11051553eabde38
Source dataset
uspto-grants-2012_05
Patent number
US08173813B2

Reaction notes

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