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Triethylamine → N',6-dihydroxy-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carboximidamide

HRID 1407942
Notes
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Reaction equation

HRID 1407942 reaction equation
[OH:1][C:2]1[C:7]([C:8]#[N:9])=[CH:6][C:5]2[C:10]3([CH2:29][O:30][C:4]=2[CH:3]=1)[C:18]1[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=1)[N:12]([CH2:19][C:20]1[CH:25]=[CH:24][C:23]([O:26][CH3:27])=[CH:22][CH:21]=1)[C:11]3=[O:28].Cl.[NH2:32][OH:33].C(N(CC)CC)C>C(O)C>[OH:33][N:32]=[C:8]([C:7]1[C:2]([OH:1])=[CH:3][C:4]2[O:30][CH2:29][C:10]3([C:18]4[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=4)[N:12]([CH2:19][C:20]4[CH:25]=[CH:24][C:23]([O:26][CH3:27])=[CH:22][CH:21]=4)[C:11]3=[O:28])[C:5]=2[CH:6]=1)[NH2:9]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 443297Hydroxyamine hydrochlorideHCID 593527586-Hydroxy-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile

Product 1

HCID 136348351N',6-dihydroxy-1'-(4-methoxybenzyl)-2'-oxo-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carboximidamideYield 99.3%

Reagents, catalysts & solvents 1

HCID 702
Ethanol
Solvent

Procedure

To a stirred solution of 6-hydroxy-1′-(4-methoxybenzyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile (0.84 g, 2.10 mmol) and hydroxylamine hydrochloride (0.20 g, 2.9 mmol) in ethanol (50 mL) was added triethylamine (0.40 mL, 2.9 mmol). The reaction mixture was stirred at reflux for 18 h and concentrated in vacuo. The residue was extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to afford N′,6-dihydroxy-1′-(4-methoxybenzyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carboximidamide (0.90 g, 99%): MS (ES+) m/z 431.9 (M+1).

Workup

  1. temperatureat reflux for 18 h
  2. concentrationconcentrated in vacuo
  3. extractionThe residue was extracted with ethyl acetate (3×50 mL)
  4. washThe combined organic extracts were washed with water and brine
  5. dry with materialdried over anhydrous sodium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated in vacuo

Sources & evidence

ORD record
ord-fba00d95ab0e41fe988e0db24907fb0a
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