Water → 4-(7-Bromo-1,3-benzodioxol-4-yl)-2-hydroxy-4-methyl-2-trifluoromethyl-valeric acid-ethyl ester

HRID 2055022Notes

Reaction equation

HRID 2055022 reaction equation
[CH2:1]([O:3][C:4](=[O:21])[C:5](=[O:20])[CH2:6][C:7]([C:10]1[C:18]2[O:17][CH2:16][O:15][C:14]=2[C:13]([Br:19])=[CH:12][CH:11]=1)([CH3:9])[CH3:8])[CH3:2].[F:22][C:23]([Si](C)(C)C)([F:25])[F:24].[F-].C([N+](CCCC)(CCCC)CCCC)CCC.O>C1COCC1>[CH2:1]([O:3][C:4](=[O:21])[C:5]([OH:20])([C:23]([F:25])([F:24])[F:22])[CH2:6][C:7]([C:10]1[C:18]2[O:17][CH2:16][O:15][C:14]=2[C:13]([Br:19])=[CH:12][CH:11]=1)([CH3:9])[CH3:8])[CH3:2]

Participants

6

Reactant 4

HCID 962WaterHCID 552549(Trifluoromethyl)trimethylsilaneHCID 2724141Tetrabutylammonium Fluoride2×HCID 692037914-(7-Bromo-1,3-benzodioxol-4-yl)-4-methyl-2-oxo-valeric acid-ethyl ester

Product 1

HCID 692058824-(7-Bromo-1,3-benzodioxol-4-yl)-2-hydroxy-4-methyl-2-trifluoromethyl-valeric acid-ethyl ester

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

300 mg of 4-(7-bromo-1,3-benzodioxol-4-yl)-4-methyl-2-oxo-valeric acid and 0.1 ml of sulfuric acid (96%) in 5 ml of ethanol are heated for 4 hours to 70° C. Then, the batch is concentrated by evaporation in a vacuum and added to water. It is extracted with ethyl acetate, washed with brine, dried and concentrated by evaporation in a vacuum. 272 mg of 4-(7-bromo-1,3-benzodioxol-4-yl)-4-methyl-2-oxo-valeric acid-ethyl ester is obtained as a yellow oil. This ester and 0.32 ml of trifluoromethyl-trimethylsilane in 4 ml of THF are mixed with 0.14 ml of a tetrabutylammonium fluoride solution (1 M in THF) at −70° C. It is stirred for 1 hour at −70° C., for 1.5 hours at −0° C., for 1 hour a and for 2 hours at room temperature. Another spatula-tip full of tetrabutylammonium fluoride is added, and after stirring is continued for 20 minutes, it is added to water. It is extracted with ethyl acetate, washed with water, dried with sodium sulfate and concentrated by evaporation in a vacuum. 297 mg of 4-(7-bromo-1,3-benzodioxol-4-yl)-2-hydroxy-4-methyl-2-trifluoromethyl-valeric acid-ethyl ester is obtained as a yellow oil. This oil is mixed in 5 ml of ether at 0° C. with 29 mg of lithium aluminum hydride, and stirred for 1 hour at 0° C. and for another 10 hours at room temperature. The batch is added to dilute hydrochloric acid, extracted with ethyl acetate, washed with water, dried with sodium sulfate and concentrated by evaporation in a vacuum. 164 mg of 4-(7-bromo-1,3-benzodioxol-4-yl)-2-hydroxy-4-methyl-2-(trifluoromethyl)pentan-1-ol is obtained as a yellow oil.

Workup

  1. stirringafter stirring
  2. waitis continued for 20 minutes
  3. extractionIt is extracted with ethyl acetate
  4. washwashed with water
  5. dry with materialdried with sodium sulfate
  6. concentrationconcentrated by evaporation in a vacuum

Sources & evidence

ORD record
ord-47d6b2ae2bc7492c89a93cc84adb02cb
Source dataset
uspto-grants-2008_02
Patent number
US07329753B2

Reaction notes

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