Trifluoroacetic acid → 4-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one

HRID 1259539Notes

Reaction equation

HRID 1259539 reaction equation
[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4](O)([C:17]1[C:25]([OH:26])=[CH:24][C:20]3[O:21][CH2:22][O:23][C:19]=3[CH:18]=1)[C:5](=[O:16])[N:6]2[CH2:11][CH2:12][CH2:13][CH2:14][CH3:15].FC(F)(F)C(O)=O.C([SiH](CC)CC)C>ClCCl>[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]([C:17]1[C:25]([OH:26])=[CH:24][C:20]3[O:21][CH2:22][O:23][C:19]=3[CH:18]=1)[C:5](=[O:16])[N:6]2[CH2:11][CH2:12][CH2:13][CH2:14][CH3:15]

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 12052TriethylsilaneHCID 120044004-bromo-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one

Product 1

HCID 588725004-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1-pentyl-1,3-dihydro-2H-indol-2-oneYield 49.1%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of 4-bromo-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one (34.9 g, 80.4 mmol) in dichloromethane (100 mL) was added trifluoroacetic acid (18.7 g, 161 mmol) and triethylsilane (18.3 g, 161 mmol). The brown solution was stirred at ambient temperature for 3 h and concentrated in vacuo to dryness. The residue was diluted with dichloromethane (200 mL), washed with saturated ammonium chloride solution (50.0 mL), brine (3×50.0 mL), dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness. The residue was crystallized from ether to give the title compound (16.5 g, 49%) as a brown solid: 1H NMR (300 MHz, CDCl3) δ 7.29-7.21 (m, 2H), 7.14 (dd, 1H), 6.58 (s, 1H), 6.10 (s, 1H), 5.85 (dd, 2H), 5.01 (s, 1H), 3.75-3.55 (m, 2H), 1.69-1.56 (m, 2H), 1.35-1.21 (m, 4H), 0.86 (t, 3H); 13C NMR (75 MHz, CDCl3) δ 177.9, 150.9, 147.6, 145.4, 141.6, 130.3 127.1 126.8, 120.8, 113.3 108.0, 106.7, 101.5, 101.2, 59.9, 48.6, 40.7, 28.9, 26.9, 22.3 13.9; MS (ES+) m/z 418.3 (M+1), 420.3 (M+1).

Workup

  1. concentrationconcentrated in vacuo to dryness
  2. additionThe residue was diluted with dichloromethane (200 mL)
  3. washwashed with saturated ammonium chloride solution (50.0 mL), brine (3×50.0 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated in vacuo to dryness
  7. customThe residue was crystallized from ether

Sources & evidence

ORD record
ord-b986dee7b4e840a4a1087c1c812820a1
Source dataset
uspto-grants-2013_06
Patent number
US08466188B2

Reaction notes

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