Tetrahydro-4H-pyran-4-one → 4-(3,5-Difluorophenyl)oxan-4-ol

HRID 879108ノート

反応式

HRID 879108 の反応式
Br[C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[C:4]([F:9])[CH:3]=1.[O:10]1[CH2:15][CH2:14][C:13](=[O:16])[CH2:12][CH2:11]1>C1COCC1>[F:9][C:4]1[CH:3]=[C:2]([C:13]2([OH:16])[CH2:14][CH2:15][O:10][CH2:11][CH2:12]2)[CH:7]=[C:6]([F:8])[CH:5]=1

参加物

4

反応物 2

HCID 121599Tetrahydro-4H-pyran-4-oneHCID 1363131-Bromo-3,5-difluorobenzene

生成物 1

HCID 193886354-(3,5-Difluorophenyl)oxan-4-ol収率 71%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

実験手順

To a solution of 1-bromo-3,5-difluorobenzene (1.6 equiv.) in THF (0.26 M) under Ar was added Mg turnings (1.6 equiv.). A reflux condenser was attached and the solution was submerged in a 90° C. oil bath and refluxed for two hours. The dihydro-2H-pyran-4(3H)-one (1.0 equiv.) was added in THF via syringe. The solution was left stirring at rt under Ar for 5 hrs. The reaction solution was quenched by addition of NH4Cl(sat) and the solution was extracted with EtOAc, washed with NaCl(sat.), dried over MgSO4, filtered, concentrated and purified by ISCO SiO2 chromatography (0-100% EtOAc/n-heptanes gradient) to yield 4-(3,5-difluorophenyl)tetrahydro-2H-pyran-4-ol in 71% yield. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.59-1.68 (m, 3H), 2.07-2.19 (m, 2H), 3.87-3.93 (m, 4H), 6.72 (tt, J=8.75, 2.20 Hz, 1H), 6.97-7.06 (m, 2H).

後処理

  1. customA reflux condenser was attached
  2. customwas submerged in a 90° C.
  3. temperaturerefluxed for two hours
  4. waitThe solution was left
  5. customThe reaction solution was quenched by addition of NH4Cl(sat)
  6. extractionthe solution was extracted with EtOAc
  7. washwashed with NaCl(sat.)
  8. dry with materialdried over MgSO4
  9. filtrationfiltered
  10. concentrationconcentrated
  11. custompurified by ISCO SiO2 chromatography (0-100% EtOAc/n-heptanes gradient)

出典と根拠

ORDレコード
ord-c3b75c7099924bcf84a0434496c1d7f6
出典データセット
uspto-grants-2015_03
特許番号
US08987457B2

反応ノート

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