Triphenylphosphine → HCID 45257216, compound

HRID 2385141Notes

Reaction equation

HRID 2385141 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].[CH3:23][C:24]1[N:29]=[C:28]([CH2:30]O)[CH:27]=[CH:26][CH:25]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1C=CC=CC=1.O1CCCC1>[CH3:30][C:28]1[N:29]=[C:24]([CH2:23][N:1]2[C:9]3[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=3)[C:3]3([C:21]4[C:12](=[CH:13][C:14]5[O:19][CH2:18][CH2:17][O:16][C:15]=5[CH:20]=4)[O:11][CH2:10]3)[C:2]2=[O:22])[CH:25]=[CH:26][CH:27]=1

Participants

7

Reactant 4

HCID 11776TriphenylphosphineHCID 707366-Methyl-2-pyridylmethanolHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 58224164Spiro[furo[2,3-g]-1,4-benzodioxin-8(7H),3'-[3H]indol]-2'(1'H)-one, 2,3-dihydro

Product 1

HCID 45257216HCID 45257216, compoundYield 41.1%

Reagents, catalysts & solvents 2

HCID 241BenzeneSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a mixture of 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.23 g, 0.79 mmol), 6-methyl-2-pyridinemethanol (0.13 g, 1.07 mmol) and triphenylphosphine (0.30 g, 1.14 mmol) in benzene (10 mL) under nitrogen was slowly added a solution of diethyl azodicarboxylate (0.22 g, 1.27 mmol) in tetrahydrofuran (6 mL). The resulting mixture was stirred at ambient temperature for 16.5 h. The solvents were removed under reduced pressure, and the residue was taken up into 2 M sodium carbonate (50 mL) and extracted with dichloromethane (3×30 mL). The combined organic solution was washed with brine (50 mL), dried with sodium sulfate, filtered and concentrated under reduced pressure. Purification by flash column chromatography with hexanes/ethyl acetate (2:1) gave 1′-[(6-methylpyridin-2-yl)methyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.13 g, 41%) as a colorless solid: mp 183-185° C. (hexanes/diethyl ether); 1H NMR (300 MHz, CDCl3) δ7.56 (dd, J=7.8, 7.5 Hz, 1H), 7.23-7.16 (m, 2H), 7.10-7.00 (m, 3H), 6.90 (d, J=7.8 Hz, 1H), 6.51 (s, 1H), 6.32 (s, 1H), 5.23 (d, J=15.9 Hz, 1H), 4.958 (d, J=9.0 Hz, 1H), 4.956 (d, J=15.9 Hz, 1H), 4.68 (d, J=9.0 Hz, 1H), 4.23-4.18 (m, 2H), 4.15-4.11 (m, 2H), 2.59 (s, 3H); 13C NMR (75 MHz, CDCl3) δ177.8, 158.2, 155.4, 154.7, 144.8, 142.2, 138.4, 138.2, 132.3, 129.0, 124.0, 123.7, 122.9, 121.2, 118.8, 111.8, 109.8, 99.6, 80.3, 64.7, 64.1, 58.3, 45.7, 24.1; MS (ES+) m/z 401.0 (M+1).

Workup

  1. customThe solvents were removed under reduced pressure
  2. extractionextracted with dichloromethane (3×30 mL)
  3. washThe combined organic solution was washed with brine (50 mL)
  4. dry with materialdried with sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customPurification by flash column chromatography with hexanes/ethyl acetate (2:1)

Sources & evidence

ORD record
ord-26c6d9d268984d009c054cc6e87a7687
Source dataset
uspto-grants-2012_09
Patent number
US08263606B2

Reaction notes

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