Cesium carbonate → 6-Fluoro-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile

HRID 2385178Notes

Reaction equation

HRID 2385178 reaction equation
[F:1][C:2]1[CH:9]=[C:8]([OH:10])[C:7]([CH:11]2[C:19]3[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=3)[N:13]([CH2:20][C:21]3[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[CH:23][CH:22]=3)[C:12]2=[O:29])=[CH:6][C:3]=1[C:4]#[N:5].Cl[CH2:31]I.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCCC1.CN(C)C=O>[F:1][C:2]1[C:3]([C:4]#[N:5])=[CH:6][C:7]2[C:11]3([CH2:31][O:10][C:8]=2[CH:9]=1)[C:19]1[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=1)[N:13]([CH2:20][C:21]1[CH:22]=[CH:23][C:24]([O:27][CH3:28])=[CH:25][CH:26]=1)[C:12]3=[O:29]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 11644ChloroiodomethaneHCID 673589962-fluoro-4-hydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile

Product 1

HCID 593525346-Fluoro-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrileYield 48.7%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 2-fluoro-4-hydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile (10.50 g, 27.03 mmol) and chloroiodomethane (5.00 mL, 68.7 mmol) in tetrahydrofuran (200 mL) and N,N-dimethylformamide (50 mL) was added cesium carbonate (26.40 g, 81.02 mmol) under nitrogen. The reaction mixture was stirred at ambient temperature for 20 h and filtered through a pad of diatomaceous earth. The filtrate was concentrated in vacuo. The residue was subjected to column chromatography and eluted with ethyl acetate/hexanes (1/3) to afford 6-fluoro-1′-(4-methoxybenzyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile (5.27 g, 48%): mp 142-143° C.; 1H NMR (300 MHz, CDCl3) δ 7.29-7.23 (m, 3H), 7.11-7.02 (m, 2H), 6.89-6.85 (m, 4H), 6.77 (d, J=9.0 Hz, 1H), 5.12-4.75 (m, 4H), 3.78 (s, 3H); MS (ES+) m/z 400.7 (M+1).

Workup

  1. filtrationfiltered through a pad of diatomaceous earth
  2. concentrationThe filtrate was concentrated in vacuo
  3. washeluted with ethyl acetate/hexanes (1/3)

Sources & evidence

ORD record
ord-9007b46e81f84190b10888f013c954e6
Source dataset
uspto-grants-2012_09
Patent number
US08263606B2

Reaction notes

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