Hydrochloric Acid → 7-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1,3-dihydro-2H-indol-2-one

HRID 1965299Notes

Reaction equation

HRID 1965299 reaction equation
[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][C:8](=[O:11])[CH:7]2[C:12]1[C:20]([OH:21])=[CH:19][C:15]2[O:16][CH2:17][O:18][C:14]=2[CH:13]=1.[CH2:22]=[O:23].[OH-].[Na+].Cl>O>[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:10]=1[NH:9][C:8](=[O:11])[C:7]2([C:12]1[C:20]([OH:21])=[CH:19][C:15]2[O:16][CH2:17][O:18][C:14]=2[CH:13]=1)[CH2:22][OH:23]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 712FormaldehydeHCID 14798Sodium HydroxideHCID 673792827-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one

Product 1

HCID 685969097-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1,3-dihydro-2H-indol-2-oneYield 53%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
0 °C

Procedure

To a mixture of 7-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (8.40 g, 24.1 mmol), para-formaldehyde (2.88 g, 96.0 mmol) and water (80 mL) was added sodium hydroxide (3.84 g, 96.0 mmol) at 0° C. The dark green solution was stirred at 0° C. for 4 h. The mixture was acidified with 3 N hydrochloride to pH 4 and extracted with ethyl acetate (3×100 mL). The combined ethyl acetate solution was washed with 25% ammonium chloride solution (50 mL) and brine (50 mL), dried over anhydrous sodium sulfate and concentrated in vacuo to dryness. The residue was treated with toluene (300 mL) to give an off white precipitate. The precipitate was filtered and dried under reduced pressure to give 7-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1,3-dihydro-2H-indol-2-one (4.80 g, 53%): 1H NMR (300 MHz, DMSO-d6) δ10.48 (s, 1H), 9.16 (s, 1H), 7.27 (dd, J=8.0, 1.0 Hz, 1H), 7.01 (s, 1H), 6.87-6.74 (m, 2H), 6.22 (s, 1H), 5.91 (s, 2H), 5.03 (br, 1H), 4.12 (d, J=10.0 Hz, 1H), 3.85 (d, J=10.0 Hz, 1H); MS (ES−) m/z 376 (M−1), 378 (M−1).

Workup

  1. extractionextracted with ethyl acetate (3×100 mL)
  2. washThe combined ethyl acetate solution was washed with 25% ammonium chloride solution (50 mL) and brine (50 mL)
  3. dry with materialdried over anhydrous sodium sulfate
  4. concentrationconcentrated in vacuo to dryness
  5. additionThe residue was treated with toluene (300 mL)
  6. customto give an off white precipitate
  7. filtrationThe precipitate was filtered
  8. customdried under reduced pressure

Sources & evidence

ORD record
ord-1fd913123c4b48bcb2ac1363a5dccf41
Source dataset
uspto-grants-2013_04
Patent number
US08415370B2

Reaction notes

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