Methanol → 1-Benzo[b]thiophen-4-yl-4-(3-chloropropyl)piperazine

HRID 1801638Notes

Reaction equation

HRID 1801638 reaction equation
[S:1]1[CH:5]=[CH:4][C:3]2[C:6]([N:10]3[CH2:15][CH2:14][N:13]([CH2:16][CH2:17][CH2:18]O)[CH2:12][CH2:11]3)=[CH:7][CH:8]=[CH:9][C:2]1=2.C(Cl)(Cl)(Cl)[Cl:21].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CO>C(Cl)Cl>[S:1]1[CH:5]=[CH:4][C:3]2[C:6]([N:10]3[CH2:15][CH2:14][N:13]([CH2:16][CH2:17][CH2:18][Cl:21])[CH2:12][CH2:11]3)=[CH:7][CH:8]=[CH:9][C:2]1=2

Participants

6

Reactant 4

HCID 887MethanolHCID 5943Carbon TetrachlorideHCID 11776TriphenylphosphineHCID 574825483-(4-Benzo[b]thiophen-4-yl-piperazin-1-yl)propanol

Product 1

HCID 574825511-Benzo[b]thiophen-4-yl-4-(3-chloropropyl)piperazine

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

3.56 g (12.9 mmol) of 3-(4-Benzo[b]thiophen-4-yl-piperazin-1-yl)propan-1-ol was suspended in 30 ml of methylene chloride, and carbon tetrachloride (30 ml) and triphenyl phosphine (4.06 g, 15.5 mmol) were added thereto followed by stirring under reflux for 3 hours. The reaction mixture was cooled to room temperature, then methanol and methylene chloride were added thereto so as to make the mixture uniform. Silica gel (30 g) was added to the uniform solution, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (silica gel: 300 g, n-hexane:ethyl acetate=2:1), then concentrated under reduced pressure to obtain 1-benzo[b]thiophen-4-yl-4-(3-chloropropyl)piperazine (2.36 g) as colorless oil.

Workup

  1. temperatureunder reflux for 3 hours
  2. additionSilica gel (30 g) was added to the uniform solution
  3. customthe solvent was evaporated under reduced pressure
  4. customThe residue was purified by silica gel column chromatography (silica gel: 300 g, n-hexane:ethyl acetate=2:1)
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-20fdbbda4f044b4d86abb178ace889da
Source dataset
uspto-grants-2013_01
Patent number
US08349840B2

Reaction notes

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