1,3-Dibromopropane → 1-[4-(3-Bromopropoxy)-3-methylmercaptophenyl]ethanone

HRID 975357Notes

Reaction equation

HRID 975357 reaction equation
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][C:3]=1[S:11][CH3:12].C([O-])([O-])=O.[K+].[K+].[Br:19][CH2:20][CH2:21][CH2:22]Br>C(#N)C>[Br:19][CH2:20][CH2:21][CH2:22][O:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][C:3]=1[S:11][CH3:12]

Participants

5

Reactant 3

HCID 80011,3-DibromopropaneHCID 11430Potassium CarbonateHCID 30176621-(4-Hydroxy-3-(methylthio)phenyl)ethan-1-one

Product 1

HCID 100406381-[4-(3-Bromopropoxy)-3-methylmercaptophenyl]ethanone

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

A mixture of 1-[4-hydroxy-3-(methylmercapto)phenyl]-ethanone (5.4 g; 30 mmol), K2CO3 (4.2 g), 1,3-dibromopropane (8 g, 39 mmol) in acetonitrile (150 ml) was heated at reflux for 3 hours and stirred at room temperature overnight. Acetonitrile was removed at reduced pressure and the residue was extracted into dichloromethane (250 ml). Insolubles were filtered off. The dichloromethane solution was concentrated. The crude product was purified on a silica gel column (SiO2, 100 g; eluted with 3:2 hexane:dichloromethane, 1.6 1). The compound crystallized upon concentration, and the product (3.5 g, 39%) was recrystallized from ethanol (40 ml) to yield 1-[4-(3-bromopropoxy)-3-(methylmercapto)phenyl]ethanone as white needles, 2.0 g; m.p.=120°-122° C.

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 3 hours
  3. customAcetonitrile was removed at reduced pressure
  4. extractionthe residue was extracted into dichloromethane (250 ml)
  5. filtrationInsolubles were filtered off
  6. concentrationThe dichloromethane solution was concentrated
  7. customThe crude product was purified on a silica gel column (SiO2, 100 g; eluted with 3:2 hexane:dichloromethane, 1.6 1)
  8. customThe compound crystallized upon concentration
  9. customthe product (3.5 g, 39%) was recrystallized from ethanol (40 ml)

Sources & evidence

ORD record
ord-9e07c3a2a5d545d7bd16d07e288de1a3
Source dataset
uspto-grants-1997_03
Patent number
US05607945

Reaction notes

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