Trifluoroacetic acid → 1-(2-cyclopropylethyl)-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one

HRID 545667Notes

Reaction equation

HRID 545667 reaction equation
[CH:1]1([CH2:4][CH2:5][N:6]2[C:14]3[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=3)[C:8](O)([C:15]3[C:23]([OH:24])=[CH:22][C:18]4[O:19][CH2:20][O:21][C:17]=4[CH:16]=3)[C:7]2=[O:26])[CH2:3][CH2:2]1.FC(F)(F)C(O)=O.C([SiH](CC)CC)C>ClCCl>[CH:1]1([CH2:4][CH2:5][N:6]2[C:14]3[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=3)[CH:8]([C:15]3[C:23]([OH:24])=[CH:22][C:18]4[O:19][CH2:20][O:21][C:17]=4[CH:16]=3)[C:7]2=[O:26])[CH2:3][CH2:2]1

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 12052TriethylsilaneHCID 588725381-(2-cyclopropylethyl)-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one

Product 1

HCID 120043801-(2-cyclopropylethyl)-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-oneYield 80%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 1-(2-cyclopropylethyl)-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (2.22 g, 6.27 mmol) in dichloromethane (30.0 mL) was added trifluoroacetic acid (2.12 g, 18.8 mmol) and triethylsilane (2.14 g, 18.8 mmol). The brown solution was stirred at ambient temperature for 0.5 h and concentrated in vacuo to dryness. The residue was diluted with dichloromethane (100 mL), washed with water (3×50.0 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 (20/80) to give the title compound (1.69 g, 80%) as a brown solid: 1H NMR (300 MHz, CDCl3) δ 9.21-9.10 (br, 1H), 7.38-7.30 (m, 2H), 7.16 (t, 1H), 6.96 (d, 1H), 6.63 (s, 1H), 6.33 (s, 1H), 5.84 (dd, 2H), 5.01 (s, 1H), 3.87-3.72 (m, 2H), 1.66-1.46 (m, 2H), 0.69-0.59 (m, 1H), 0.43-0.30 (m, 2H), 0.09-0.06 (m, 2H); 13C NMR (75 MHz, CDCl3) δ 178.8, 151.3, 147.6, 144.1, 141.5, 128.7, 126.2, 123.1, 115.2, 109.5, 109.4, 106.5, 101.5, 101.2, 47.4, 40.5, 32.2, 8.6, 4.3, 4.2; MS (ES+) m/z 338.3 (M+1).

Workup

  1. concentrationconcentrated in vacuo to dryness
  2. additionThe residue was diluted with dichloromethane (100 mL)
  3. washwashed with water (3×50.0 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated in vacuo to dryness
  7. washeluting with ethyl acetate/hexane (20/80)

Sources & evidence

ORD record
ord-670895a430924a7d861326217ffe856f
Source dataset
uspto-grants-2011_05
Patent number
US07935721B2

Reaction notes

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