Potassium Carbonate → 3-Ethoxy-2-(4-fluoro-phenyl)-cyclopent-2-enone

HRID 9274

Reaction equation

HRID 9274 reaction equation
Br[C:2]1[C:3](=[O:10])[CH2:4][CH2:5][C:6]=1[O:7][CH2:8][CH3:9].C([O-])([O-])=O.[K+].[K+].[F:17][C:18]1[CH:23]=[CH:22][C:21](B(O)O)=[CH:20][CH:19]=1>C1(C)C=CC=CC=1.C1C=CC=CC=1.O.CCO.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH2:8]([O:7][C:6]1[CH2:5][CH2:4][C:3](=[O:10])[C:2]=1[C:21]1[CH:22]=[CH:23][C:18]([F:17])=[CH:19][CH:20]=1)[CH3:9]

Participants

12

Reactant 3

HCID 11430Potassium CarbonateHCID 2856454-Fluorophenylboronic acidHCID 107269112-Bromo-3-ethoxycyclopent-2-enone

Product 1

HCID 219861393-Ethoxy-2-(4-fluoro-phenyl)-cyclopent-2-enoneYield 70%

Reagents, catalysts & solvents 8

HCID 11776TriphenylphosphineCatalystHCID 6505921(1E,4E)-1,5-diphenylpenta-1,4-dien-3-one; palladiumCatalystHCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 178418789HCID 178418789, compoundCatalystHCID 241BenzeneSolventHCID 702EthanolSolventHCID 962WaterSolventHCID 1140TolueneSolvent

Conditions

Temperature
100 °C

Procedure

2-Bromo-3-ethoxy-cyclopent-2-enone (Intermediate NINE2) (10.5 g, 51.2 mmol) and K2CO3 (14.2 g, 102 mmol) in toluene (100 mL), benzene (100 mL) and H2O (50 mL) was treated with a solution of 4-fluorophenylboronic acid (9.31 g, 66.5) in EtOH (100 mL). Tetrakis(triphenylphosphine)palladium(0) Pd(PPh3)4 (3 g, 2.6 mmol), bis(dibenzylideneacetone)palladium(0), Pd2(dba)3 (0.47 g, 0.5 mmol) and triphenylphosphine (0.27 g, 1.0 mmol) were added and the mixture was purged with N2 for 15 m. The mixture was heated to 100° C. for 15 h. The mixture was diluted with water and EtOAc:hexane. After extracting with EtOAc:hexane, the combined organic layers were dried over MgSO4, filtered and evaporated to dryness. The crude oil was purified by column chromatography on silica gel with 2.5% EtOAc:CH2Cl2 to give 3-ethoxy-2-(4-fluoro-phenyl)-cyclopent-2-enone (Intermediate NINE3) 7.85 g (70%).

Workup

  1. customthe mixture was purged with N2 for 15 m
  2. additionThe mixture was diluted with water and EtOAc
  3. extractionAfter extracting with EtOAc
  4. dry with materialhexane, the combined organic layers were dried over MgSO4
  5. filtrationfiltered
  6. customevaporated to dryness
  7. customThe crude oil was purified by column chromatography on silica gel with 2.5% EtOAc

Sources & evidence

ORD record
ord-1b99ecc263fc43ae8cb7d0f030d361c9
Source dataset
uspto-grants-2006_08
Patent number
US07091232B2

Linked notes

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