Water → 2-[(2'-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-1'(2'H)-yl)methyl]pyridine-3-carboxylic acid

HRID 1407844Notes

Reaction equation

HRID 1407844 reaction equation
[O:1]=[C:2]1[C:10]2([C:22]3[C:13](=[CH:14][C:15]4[O:20][CH2:19][CH2:18][O:17][C:16]=4[CH:21]=3)[O:12][CH2:11]2)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]1[CH2:23][C:24]1[C:29]([C:30]([O:32]CC)=[O:31])=[CH:28][CH:27]=[CH:26][N:25]=1.[OH-].[Li+].O1CCCC1.O>CO>[O:1]=[C:2]1[C:10]2([C:22]3[C:13](=[CH:14][C:15]4[O:20][CH2:19][CH2:18][O:17][C:16]=4[CH:21]=3)[O:12][CH2:11]2)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]1[CH2:23][C:24]1[C:29]([C:30]([OH:32])=[O:31])=[CH:28][CH:27]=[CH:26][N:25]=1

Participants

6

Reactant 4

HCID 962WaterHCID 3939Lithium HydroxideHCID 8028TetrahydrofuranHCID 59352395ethyl 2-[(2'-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-1'(2'H)-yl)methyl]pyridine-3-carboxylate

Product 1

HCID 593522232-[(2'-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-1'(2'H)-yl)methyl]pyridine-3-carboxylic acidYield 91.1%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A 250 mL round-bottom flask was charged with ethyl 2-[(2′-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-1′(2′H)-yl)methyl]pyridine-3-carboxylate (2.3 g, 5.0 mmol), lithium hydroxide (0.48 g, 20.0 mmol), tetrahydrofuran (30 mL), water (50 mL) and methanol (30 mL). The reaction mixture was stirred under nitrogen at reflux for 5 h, allowed to cool to ambient temperature and concentrated in vacuo. The residue was taken up in water (100 mL) and acidified to pH 1 by the addition of 10 M hydrochloric acid, causing a precipitate to be deposited. The solid was collected by filtration, washed with water and recrystallized from ethanol (50 mL) to afford 2-[(2′-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-1′(2′H)-yl)methyl]pyridine-3-carboxylic acid (1.96 g, 91%) as an off-white solid: 1H NMR (300 MHz, DMSO-d6) δ 8.57-8.45 (m, 1H), 8.33-8.26 (m, 1H), 7.42 (dd, J=7.82, 4.77 Hz, 1H), 7.21-6.83 (m, 4H), 6.49-6.44 (m, 2H), 5.39 (ABq, 2H), 4.72 (ABq, 2H), 4.24-4.00 (m, 4H).

Workup

  1. temperatureat reflux for 5 h
  2. concentrationconcentrated in vacuo
  3. additionacidified to pH 1 by the addition of 10 M hydrochloric acid
  4. filtrationThe solid was collected by filtration
  5. washwashed with water
  6. customrecrystallized from ethanol (50 mL)

Sources & evidence

ORD record
ord-dd05112661344073bf733e7f139f34fb
Source dataset
uspto-grants-2014_12
Patent number
US08916580B2

Reaction notes

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