2-Bromo-3-methyl-2-cyclopenten-1-ol → 2-Ethyl-3-methyl-cyclopent-2-enol

HRID 28759

반응식

HRID 28759 반응식
Br[C:2]1[CH:3]([OH:8])[CH2:4][CH2:5][C:6]=1[CH3:7].[CH2:9]([Mg]Br)[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>[CH2:9]([C:2]1[CH:3]([OH:8])[CH2:4][CH2:5][C:6]=1[CH3:7])[CH3:10]

참가 물질

5

반응물 2

HCID 107497992-Bromo-3-methyl-2-cyclopenten-1-olHCID 178418443HCID 178418443, 화합물

생성물 1

HCID 219861782-Ethyl-3-methyl-cyclopent-2-enol

시약·촉매·용매 2

HCID 2724937Dichloro(1,1'-(1,3-propanediyl)bis(1,1-diphenylphosphine-kappaP))nickel촉매HCID 8028Tetrahydrofuran용매

실험 절차

The alcohol (Intermediate V2, 16 mmol) in THF (30 mL) at 0° C. was treated with ethyl 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 hours following the procedure of 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 SiO, with 20% EtOAc:Hx to yield 2-ethyl-3-methyl-cyclopent-2-enol (Intermediate V3). Use of the alcohol (Intermediate V3) in the applicable steps of Method A and Method P produced 4-(2-ethyl-3-methyl-cyclopent-2-enylmethyl)-1,3-dihydro-imidazol-2-one (Compound 64). 1NMR (300 MHz, CD3OD-d4): δ 6.03 (s, 1H), 2.88 (brs, 1H), 2.65-2.59 (m, 1H), 2.27-1.83 (series of m, 6H), 1.62 (s, 3H), 1.54-1.45 (m, 1H), 0.97 (t, J=6 Hz, 3H).

후처리

  1. temperaturethe mixture was heated
  2. temperatureto reflux for 3 hours
  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 SiO, with 20% EtOAc

출처 및 근거

ORD 기록
ord-a8ce339216394616aad69d9b3b890df3
출처 데이터셋
uspto-grants-2008_09
특허 번호
US07419994B2

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