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

HRID 2385570Notes

Reaction equation

HRID 2385570 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]

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 702EthanolSolvent

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-e29eb75c14ad4f269d99cd10207d3a85
Source dataset
uspto-grants-2012_09
Patent number
US08263606B2

Reaction notes

Loading…