2-(1,3-Dioxolan-2-yl)-3-bromo-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene → 2-(1,3-Dioxolan-2-yl)-3-(4-methylbenzyl)-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene

HRID 1836891Notes

Reaction equation

HRID 1836891 reaction equation
[O:1]1[CH2:5][CH2:4][O:3][CH:2]1[C:6]1[C:15](Br)=[CH:14][C:13]2[C:12]([CH3:18])([CH3:17])[CH2:11][CH2:10][C:9]([CH3:20])([CH3:19])[C:8]=2[CH:7]=1.[Cl-].[CH3:22][C:23]1[CH:30]=[CH:29][C:26]([CH2:27][Zn+])=[CH:25][CH:24]=1>O1CCCC1>[O:1]1[CH2:5][CH2:4][O:3][CH:2]1[C:6]1[C:15]([CH2:22][C:23]2[CH:30]=[CH:29][C:26]([CH3:27])=[CH:25][CH:24]=2)=[CH:14][C:13]2[C:12]([CH3:18])([CH3:17])[CH2:11][CH2:10][C:9]([CH3:20])([CH3:19])[C:8]=2[CH:7]=1

Participants

4

Reactant 2

HCID 234989352-(1,3-Dioxolan-2-yl)-3-bromo-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthaleneHCID 178425362HCID 178425362, compound

Product 1

HCID 234989722-(1,3-Dioxolan-2-yl)-3-(4-methylbenzyl)-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthaleneYield 89%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a mixture of 2-(1,3-dioxolan-2-yl)-3-bromo-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene (250 mg, 0.74 mmol) and tetrakis(triphenylphospine)palladium(0) (21 mg, 0.018 mmol) under an argon atmosphere was added a 0.5 M tetrahydrofuran solution of 4-methylbenzylzinc chloride (7.3 mL, 3.68 mmol). The reaction mixture was stirred at reflux overnight and partitioned between saturated ammonium chloride solution and ethyl acetate. The organic layer was washed with brine, dried over MgSO4, and concentrated in vacuo. The residue was purified by preparative thin layer chromatography on silica gel (5% ethyl acetate/hexane) to give 2-(1,3-dioxolan-2-yl)-3-(4-methylbenzyl)-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene as a white crystalline solid (240 mg, 89%).

Workup

  1. temperatureat reflux overnight
  2. custompartitioned between saturated ammonium chloride solution and ethyl acetate
  3. washThe organic layer was washed with brine
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated in vacuo
  6. customThe residue was purified by preparative thin layer chromatography on silica gel (5% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-2039a1aa70bd40c7b4ee152cc79a1b5f
Source dataset
uspto-grants-2004_08
Patent number
US06777418B2

Reaction notes

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