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Hydrochloric Acid → 6-Hydroxy-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile

HRID 1407595
Notes
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Reaction equation

HRID 1407595 reaction equation
[OH: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+].Cl>O1CCCC1>[OH: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]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 10796Cesium carbonateHCID 11644ChloroiodomethaneHCID 673569012,4-dihydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile

Product 1

HCID 593527586-Hydroxy-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrileYield 26.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 2,4-dihydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile (9.40 g, 24.3 mmol) and chloroiodomethane (4.40 mL, 60.4 mmol) in tetrahydrofuran (250 mL) was added cesium carbonate (23.8 g, 73.0 mmol) under nitrogen. The reaction mixture was stirred at ambient temperature for 20 h and 5% w/v hydrochloric acid was added. The mixture was extracted with ethyl acetate (3×200 mL). The combined organic extracts were washed with water and brine, and dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo. The residue was subjected to column chromatography and eluted with ethyl acetate to afford 6-hydroxy-1′-(4-methoxybenzyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile (2.57 g, 26%): mp 112-114° C. (ethyl acetate/hexanes); 1H NMR (300 MHz, DMSO-d6) δ 11.32 (s, 1H), 7.29-7.16 (m, 4H), 7.02-6.97 (m, 2H), 6.89-6.85 (m, 3H), 6.54 (s, 1H), 4.93-4.77 (m, 4H), 3.68 (s, 3H); MS (ES+) m/z 398.8 (M+1).

Workup

  1. additionwas added
  2. extractionThe mixture was extracted with ethyl acetate (3×200 mL)
  3. washThe combined organic extracts were washed with water and brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated in vacuo
  7. washeluted with ethyl acetate

Sources & evidence

ORD record
ord-a9769e267fdb4cdd92c17460676871ee
Source dataset
uspto-grants-2014_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08916580B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes