Triphenylphosphine → 4',7'-dichloro-1'-pentylspiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1'H)-one

HRID 545829Notes

Reaction equation

HRID 545829 reaction equation
[Cl:1][C:2]1[CH:10]=[CH:9][C:8]([Cl:11])=[C:7]2[C:3]=1[C:4]([C:20]1[C:28](O)=[CH:27][C:23]3[O:24][CH2:25][O:26][C:22]=3[CH:21]=1)([CH2:18][OH:19])[C:5](=[O:17])[N:6]2[CH2:12][CH2:13][CH2:14][CH2:15][CH3:16].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O>O1CCCC1>[Cl:1][C:2]1[CH:10]=[CH:9][C:8]([Cl:11])=[C:7]2[C:3]=1[C:4]1([C:20]3=[CH:21][C:22]4[O:26][CH2:25][O:24][C:23]=4[CH:27]=[C:28]3[O:19][CH2:18]1)[C:5](=[O:17])[N:6]2[CH2:12][CH2:13][CH2:14][CH2:15][CH3:16]

Participants

5

Reactant 3

HCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 588724744,7-dichloro-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1-pentyl-1,3-dihydro-2H-indol-2-one

Product 1

HCID 592634294',7'-dichloro-1'-pentylspiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1'H)-oneYield 20%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 4,7-dichloro-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1-pentyl-1,3-dihydro-2H-indol-2-one (0.69 g, 1.57 mmol) in anhydrous tetrahydrofuran (15.0 mL) was added triphenylphosphine (0.54 g, 2.04 mmol) followed by slow addition of diisopropyl azodicarboxylate (0.41 g, 2.04 mmol) at 0° C. The brown reaction mixture was stirred at ambient temperature for 16 h and quenched with ammonium chloride solution (2.00 mL). The organic solvent was removed in vacuo. The residue was dissolved in ethyl acetate (20.0 mL), washed with 10% aqueous HCl solution (10.0 mL), dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness. The residue was subjected to column chromatography eluting with ethyl acetate/hexane (35%) to give a solid, which was crystallized from ethyl acetate/ether to give the title compound (0.13 g, 20%) as a colorless solid: mp 106-108° C.; 1H NMR (300 MHz, CDCl3) δ 7.24-7.16 (m, 1H), 6.81 (d, 1H), 6.44 (s, 1H), 6.07 (s, 1H), 5.86 (dd, 2H), 4.87 (dd, 2H), 4.12-4.07 (m, 2H), 1.76-1.66 (m, 2H) 1.36-1.31 (m, 4H), 0.89 (t, 3H); 13C NMR (75 MHz, CDCl3) δ 177.5, 157.0, 149.2, 142.1, 140.0, 132.3, 131.0, 130.2, 124.6, 116.0, 113.8, 102.3, 101.5, 93.3, 77.2, 58.5, 42.1, 29.5, 28.7, 22.3, 14.0; MS (ES+) m/z 420.4 (M+1).

Workup

  1. customquenched with ammonium chloride solution (2.00 mL)
  2. customThe organic solvent was removed in vacuo
  3. dissolutionThe residue was dissolved in ethyl acetate (20.0 mL)
  4. washwashed with 10% aqueous HCl solution (10.0 mL)
  5. dry with materialdried over anhydrous sodium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated in vacuo to dryness
  8. washeluting with ethyl acetate/hexane (35%)
  9. customto give a solid, which
  10. customwas crystallized from ethyl acetate/ether

Sources & evidence

ORD record
ord-a7ed828babb5427cb4277e92f3aeafbe
Source dataset
uspto-grants-2011_05
Patent number
US07935721B2

Reaction notes

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