Triphenylphosphine → 4'-bromo-1'-(pyridin-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one

HRID 645158Notes

Reaction equation

HRID 645158 reaction equation
[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([C:21]1[C:22](O)=[CH:23][C:24]3[O:28][CH2:27][CH2:26][C:25]=3[CH:29]=1)([CH2:19][OH:20])[C:5](=[O:18])[N:6]2[CH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][N:13]=1.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>O1CCOCC1>[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]1([CH2:19][O:20][C:22]3[CH:23]=[C:24]4[C:25](=[CH:29][C:21]1=3)[CH2:26][CH2:27][O:28]4)[C:5](=[O:18])[N:6]2[CH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][N:13]=1

Participants

5

Reactant 3

HCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 588725124-bromo-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-3-(hydroxymethyl)-1-(Pyridin-2-ylmethyl)-1,3-dihydro-2H-indol-2-one

Product 1

HCID 592634004'-bromo-1'-(pyridin-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-oneYield 37%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

A mixture of 4-bromo-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-3-(hydroxymethyl)-1-(pyridin-2-ylmethyl)-1,3-dihydro-2H-indol-2-one (1.81 g, 3.88 mmol), triphenylphosphine (2.04 g, 7.77 mmol) and diisopropyl azodicarboxylate (1.57 g, 7.77 mmol) in anhydrous dioxane (60 mL) was heated at reflux for 16 h. After cooling down to ambient temperature, the solvent was removed in vacuo. The gummy residue was diluted with ethyl acetate (50.0 mL), washed with water (3×25.0 mL), brine (3×25.0 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 (80%) to give the title compound (0.64 g, 37%) as colorless solid: mp>200° C.; 1H NMR (300 MHz, DMSO-d6) δ 8.47 (d, 1H), 7.77 (dt, 1H), 7.37 (d, 1H), 7.27 (dt, 1H), 7.19-7.13 (m, 2H), 6.94 (dd, 1H), 6.61 (s, 1H), 6.33 (s, 1H), 5.08 (d, 1H), 5.03 (d, 1H), 4.93 (d, 1H), 4.74 (d, 1H), 4.48 (t, J=8.6 Hz, 2H), 2.96 (t, 2H); 13C NMR (75 MHz, DMSO-d6) δ 177.4, 162.2, 161.8, 155.3, 149.8, 145.3, 137.6, 131.0, 130.5, 126.8, 123.3, 122.2, 119.9, 119.5, 119.0, 118.1, 109.3, 92.4, 77.5, 72.5, 58.8, 45.3, 28.8; MS (ES+) m/z 451.3 (M+1).

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 16 h
  3. customthe solvent was removed in vacuo
  4. additionThe gummy residue was diluted with ethyl acetate (50.0 mL)
  5. washwashed with water (3×25.0 mL), brine (3×25.0 mL)
  6. dry with materialdried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationThe filtrate was concentrated in vacuo to dryness
  9. washeluting with ethyl acetate/hexane (80%)

Sources & evidence

ORD record
ord-20afbbbca0304d3a9a7ba55925b62419
Source dataset
uspto-grants-2010_04
Patent number
US07700641B2

Reaction notes

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