5-Fluoro-1-(4-methoxybenzyl)indoline-2,3-dione → 5-Fluoro-1-(4-methoxy-benzyl)-1,3-dihydro-indol-2-one

HRID 853831Notes

Reaction equation

HRID 853831 reaction equation
[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH2:11][C:12]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=1)[C:6](=[O:20])[C:5]2=O>O.NN.C(O)C.O>[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH2:11][C:12]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=1)[C:6](=[O:20])[CH2:5]2

Participants

5

Reactant 1

HCID 76771005-Fluoro-1-(4-methoxybenzyl)indoline-2,3-dione

Product 1

HCID 210822565-Fluoro-1-(4-methoxy-benzyl)-1,3-dihydro-indol-2-oneYield 90.3%

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 962WaterSolventHCID 24654Hydrazine hydrate (1:1)Solvent

Procedure

A solution of 5-fluoro-1-(4-methoxy-benzyl)-1H-indole-2,3-dione (7.1 g, 24.9 mmol) in hydrazine hydrate (35 mL) and ethanol (15 mL) was refluxed overnight, diluted with water and extracted twice with ethyl acetate. The combined organics were dried over Na2SO4, filtered and concentrated. The residue was purified by silica gel chromatography using a gradient of 0-100% ethyl acetate in hexane to afford 6.1 g (90%) of 5-fluoro-1-(4-methoxy-benzyl)-1,3-dihydro-indol-2-one; 1H NMR (CDCl3, 400 MHz) δ 3.59 (s, 2H), 3.77 (s, 3H), 4.83 (s, 2H), 6.63 (dd, 1H, J=4.2, J2=8.6), 6.82-6.91 (m, 3H), 6.96-7.01 (m, 1H), 7.19-7.23 (m, 1H), 7.27-7.31 (m, 1H); HPLC-MS calcd. for C16H14FNO2 (M+H+) 272.1, found 272.3.

Workup

  1. extractionextracted twice with ethyl acetate
  2. dry with materialThe combined organics were dried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe residue was purified by silica gel chromatography

Sources & evidence

ORD record
ord-615616959e0c4b5aa6b645206817e24b
Source dataset
uspto-grants-2007_08
Patent number
US07256207B2

Reaction notes

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