2-Bromo-cyclopent-2-enol → 2-Isobutyl-cyclopent-2-enol

HRID 560128

反応式

HRID 560128 の反応式
Br[C:2]1[CH:3]([OH:7])[CH2:4][CH2:5][CH:6]=1.[CH2:8]([Mg]Br)[CH:9]([CH3:11])[CH3:10]>C1COCC1.[Ni](Cl)Cl.C1(P(C2C=CC=CC=2)CCCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH2:8]([C:2]1[CH:3]([OH:7])[CH2:4][CH2:5][CH:6]=1)[CH:9]([CH3:11])[CH3:10]

参加物

5

反応物 2

HCID 111374622-Bromo-cyclopent-2-enol2 回HCID 178418816HCID 178418816、化合物

生成物 1

HCID 219862102-Isobutyl-cyclopent-2-enol

試薬・触媒・溶媒 2

HCID 2724937Dichloro(1,1'-(1,3-propanediyl)bis(1,1-diphenylphosphine-kappaP))nickel触媒HCID 8028Tetrahydrofuran溶媒

実験手順

The alcohol (Intermediate D3, 16 mmol) in THF (30 mL) at 0 EC was treated with isobutyl magnesium bromide (40 mmol). The catalyst, 1,3-bis(diphenylphosphino)propane nickel (II) chloride (0.75 mmol) (NiCl2dppp) was added in one portion and the mixture was heated to reflux for 3 h. (see: Organ et al. J. Org. Chem. 1997, 62, 1523, incorporated herein by reference). The reaction mixture was cooled to rt and quenched with sat. NH4Cl solution. The mixture was filtered and partitioned between brine and diethyl ether. The organic layer was removed and dried over Na2SO4, filtered and concentrated under vacuum. The oil was purified by chromatography on SiO2 with 20% EtOAc:Hx to yield 2-isobutyl-cyclopent-2-enol (Intermediate D4). Use of 2-isobutyl-cyclopent-2-enol (Intermediate D4) in Method A produced 4-(2-isobutyl-cyclopent-2-enylmethyl)-1,3-dihydro-imidazole-2-thione (Compound 20).

後処理

  1. temperaturethe mixture was heated
  2. temperatureto reflux for 3 h. (
  3. customquenched with sat. NH4Cl solution
  4. filtrationThe mixture was filtered
  5. custompartitioned between brine and diethyl ether
  6. customThe organic layer was removed
  7. dry with materialdried over Na2SO4
  8. filtrationfiltered
  9. concentrationconcentrated under vacuum
  10. customThe oil was purified by chromatography on SiO2 with 20% EtOAc

出典と根拠

ORDレコード
ord-3d3b600fb25f4a6d999db890f9c3252b
出典データセット
uspto-grants-2011_11
特許番号
US08063086B2

関連ノート

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