Diisobutylaluminum hydride → HCID 22226108, compound

HRID 1883268Notes

Reaction equation

HRID 1883268 reaction equation
C(O[C:4](=[O:27])/[C:5](/[F:26])=[C:6](\[C:8]1[C:17]([O:18][CH2:19][CH2:20][CH3:21])=[CH:16][C:15]2[C:14]([CH3:23])([CH3:22])[CH2:13][CH2:12][C:11]([CH3:25])([CH3:24])[C:10]=2[CH:9]=1)/[CH3:7])C.[CH3:28]C(C[AlH]CC(C)C)C>C1COCC1>[F:26]/[C:5](=[C:6](/[C:8]1[C:17]([O:18][CH2:19][CH2:20][CH3:21])=[CH:16][C:15]2[C:14]([CH3:23])([CH3:22])[CH2:13][CH2:12][C:11]([CH3:25])([CH3:24])[C:10]=2[CH:9]=1)\[CH2:7][CH3:28])/[CH2:4][OH:27]

Participants

4

Reactant 2

HCID 14487Diisobutylaluminum hydrideHCID 20740816(E)-2-Fluoro-3-(5,5,8,8-tetramethyl-3-propoxy-5,6,7,8-tetrahydro-naphthalen-2-yl)-but-2-enoic acid ethyl ester

Product 1

HCID 22226108HCID 22226108, compoundYield 45%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-78 °C

Procedure

To a solution of(E)-2-fluoro-3-(5,5,8,8-tetramethyl-3-propoxy-5,6,7,8-tetrahydro-naphthalen-2-yl)-but-2-enoic acid ethyl ester (Intermediate 6, 2.2 g, 5.85 mmol) in THF (50 mL) at −78° C. was added DIBAL-H (23.4 mL, 1.0 M in CH2Cl2, 23.4 mmol) over 10 min. After stirring at −78° C. for 3 h, the reaction was quenched with aqueous NH4Cl followed by 1M HCl and was extracted with Et2O (×3). The combined organic layer was washed with brine, dried over Na2SO4, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel (10% EtOAc-hexane) to give the title compound (1.02 g, 45% over 2 steps).

Workup

  1. customthe reaction was quenched with aqueous NH4Cl
  2. extractionwas extracted with Et2O (×3)
  3. washThe combined organic layer was washed with brine
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated in vacuo
  6. customThe residue was purified by flash column chromatography on silica gel (10% EtOAc-hexane)

Sources & evidence

ORD record
ord-1b4f710c95f04873b3cbff6dbf6ca583
Source dataset
uspto-grants-2004_07
Patent number
US06759547B1

Reaction notes

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