Cesium carbonate → 1'-(1,4-dioxan-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one

HRID 2385232Notes

Reaction equation

HRID 2385232 reaction equation
[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[C:3]2([C:21]3[C:12](=[CH:13][C:14]4[O:19][CH2:18][CH2:17][O:16][C:15]=4[CH:20]=3)[O:11][CH2:10]2)[C:2]1=[O:22].I[CH2:24][CH:25]1[CH2:30][O:29][CH2:28][CH2:27][O:26]1.C(=O)([O-])[O-].[Cs+].[Cs+]>CC(=O)CC.C(OCC)(=O)C>[O:26]1[CH2:27][CH2:28][O:29][CH2:30][CH:25]1[CH2:24][N:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[C:3]2([C:21]3[C:12](=[CH:13][C:14]4[O:19][CH2:18][CH2:17][O:16][C:15]=4[CH:20]=3)[O:11][CH2:10]2)[C:2]1=[O:22]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 27630452-(Iodomethyl)-1,4-dioxaneHCID 58224164Spiro[furo[2,3-g]-1,4-benzodioxin-8(7H),3'-[3H]indol]-2'(1'H)-one, 2,3-dihydro

Product 1

HCID 593525101'-(1,4-dioxan-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one

Reagents, catalysts & solvents 2

HCID 6569Methyl Ethyl KetoneSolventHCID 8857Ethyl AcetateSolvent

Procedure

A mixture of 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.30 g, 1.03 mmol), 2-(iodomethyl)-1,4-dioxane (0.31 g, 1.35 mmol) and cesium carbonate (0.52 g, 1.58 mmol) in 2-butanone (7 mL) was stirred at reflux under nitrogen for 4 h. Once cooled, the reaction was diluted with ethyl acetate and the suspension was filtered through Celite. The filtrate was concentrated under reduced pressure and the residue was purified by flash column chromatography with dichloromethane/diethyl ether (14:1) to afford 1′-(1,4-dioxan-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one as an inseparable mixture with unreacted lactam (0.36 g). A mixture of this material, benzyl bromide (0.12 mL, 1.00 mmol) and cesium carbonate (0.50 g, 1.55 mmol) in 2-butanone (7 mL) was then stirred at reflux under nitrogen for 15 h. Work-up as described above and purified by flash column chromatography with (hexanes/ethyl acetate) (2:1, increased to 1:1) afforded 1′-(1,4-dioxan-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.24 g, 58%) as a colorless solid, along with 1′-benzyl-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.09 g, 24%) as a colorless solid. Characterization for 1-(1,4-dioxan-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one: mp 160-165° C. (hexanes); 1H NMR (300 MHz, CDCl3) (diastereomers) δ7.26-7.34 (m, 1H), 7.16 (d, J=7.5 Hz, 1H), 7.01-7.09 (m, 2H), 6.49 (s, 1H), 6.24 (s, 0.5H), 6.21 (s, 0.5H), 4.88 (d, J=8.9 Hz, 0.5 Hz), 4.87 (d, J=8.9 Hz, 0.5H), 4.64 (d, J=8.9 Hz, 0.5H), 4.63 (d, J=8.9 Hz, 0.5H), 4.22-4.16 (m, 2H), 4.15-4.09 (m, 2H), 3.99-3.78 (m, 4H), 3.76-3.55 (m, 4H), 3.47-3.37 (m, 1H); 13C NMR (75 MHz, CDCl3) (diastereomers) δ177.9, 177.8, 156.3, 155.3, 144.71, 144.69, 142.72, 142.66, 138.42, 138.39, 132.4, 132.3, 128.91, 128.85, 123.9, 123.8, 123.5, 121.3, 121.1, 111.7, 111.6, 109.6, 109.4, 99.49, 99.46, 80.2, 80.0, 73.32, 73.29, 69.4, 69.2, 66.8, 66.7, 66.52, 66.48, 64.6, 64.0, 58.1, 58.0, 41.85, 41.76; MS (ES+) m/z 396.2 (M+1).

Workup

  1. temperatureat reflux under nitrogen for 4 h
  2. temperatureOnce cooled
  3. filtrationthe suspension was filtered through Celite
  4. concentrationThe filtrate was concentrated under reduced pressure
  5. customthe residue was purified by flash column chromatography with dichloromethane/diethyl ether (14:1)

Sources & evidence

ORD record
ord-c2fc8dc35a45442cb6e015c3ece8e56d
Source dataset
uspto-grants-2012_09
Patent number
US08263606B2

Reaction notes

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