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Trifluoroacetic acid → 2,4-dihydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile

HRID 1407493
Notes
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Reaction equation

HRID 1407493 reaction equation
[OH:1][C:2]1[CH:9]=[C:8]([OH:10])[C:7]([C:11]2(O)[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].C([SiH](CC)CC)C.FC(F)(F)C(O)=O>ClCCl>[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:22]=[CH:23][C:24]([O:27][CH3:28])=[CH:25][CH:26]=3)[C:12]2=[O:29])=[CH:6][C:3]=1[C:4]#[N:5]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 12052TriethylsilaneHCID 673766482,4-dihydroxy-5-[3-hydroxy-1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile

Product 1

HCID 673569012,4-dihydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrileYield 98.4%

Reagents, catalysts & solvents 1

HCID 6344
Dichloromethane
Solvent

Procedure

To a stirred suspension of 2,4-dihydroxy-5-[3-hydroxy-1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile (10.3 g, 25.5 mmol) and triethylsilane (12.3 mL, 77.0 mmol) in dichloromethane (100 mL) was added trifluoroacetic acid (10.0 mL, 129 mmol). The reaction mixture was stirred at ambient temperature for 18 h and concentrated in vacuo. The residue was triturated in hexanes to afford 2,4-dihydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile (9.70 g, 98%): mp 162-163° C. (hexanes); 1H NMR (300 MHz, CDCl3) δ 10.84 (s, 1H), 10.47 (s, 1H), 7.39 (s, 1H), 7.28 (d, J=9.0 Hz, 2H), 7.13-7.08 (m, 1H), 6.93-6.78 (m, 5H), 6.43 (s, 1H), 5.72 (s, 1H), 4.92-4.73 (m, 3H), 3.69 (s, 3H); MS (ES+) m/z 386.9 (M+1).

Workup

  1. concentrationconcentrated in vacuo
  2. customThe residue was triturated in hexanes

Sources & evidence

ORD record
ord-e842ca7165bd4416842cca7871f1b6d4
Source dataset
uspto-grants-2014_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08916580B2

Reaction notes

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