Chlorotrimethylsilane → 8-(4-Iodo-phenyl)-1,4-dioxa-spiro[4.5]decan-8-ol

HRID 1173269Notes

Reaction equation

HRID 1173269 reaction equation
I[C:2]1[CH:7]=[CH:6][C:5]([I:8])=[CH:4][CH:3]=1.[Li]CCCC.[O:14]1[C:18]2([CH2:23][CH2:22][C:21](=[O:24])[CH2:20][CH2:19]2)[O:17][CH2:16][CH2:15]1.C[Si](Cl)(C)C>C1COCC1>[I:8][C:5]1[CH:6]=[CH:7][C:2]([C:21]2([OH:24])[CH2:22][CH2:23][C:18]3([O:17][CH2:16][CH2:15][O:14]3)[CH2:19][CH2:20]2)=[CH:3][CH:4]=1

Participants

6

Reactant 4

HCID 6397ChlorotrimethylsilaneHCID 12208p-DiiodobenzeneHCID 5674151,4-Dioxaspiro[4.5]decan-8-oneHCID 178418339Butyllithium

Product 1

HCID 578033098-(4-Iodo-phenyl)-1,4-dioxa-spiro[4.5]decan-8-olYield 66.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of 1,4 diiodobenzene (16.5 g, 50 mmol) in THF (350 mL) at −78° C. was added n-BuLi (2.5 M, 24 mL) over 1 hour. After being stirred for an additional 30 minutes, a solution of 1,4-dioxa-spiro[4.5]decan-8-one (7.8 g, 50 mmol) in THF (30 mL) was added in and the resulting mixture was sired for 3 hours. To the mixture was added TMSCl (5.4 g, 50 mmol) and the resulting mixture was allowed to warm to rt and stirred at rt for 18 hours. The reaction mixture was neutralized to pH 6.0, and extracted with ethyl acetate (3×50 mL). The organic extracts were combined, washed with saline solution (2×50 mL), dried over sodium sulfate, concentrated in vacuo. The residue was chromatographed on silica gel, eluting with hexane/ethyl acetate (95/5 to 100/0). The appropriate fractions were combined to give 8-(4-Iodo-phenyl)-1,4-dioxa-spiro[4.5]decan-8-ol (12 g, 66.6%) with LCMS: 361.2 (M+H+, 100%) and {[8-(4-iodophenyl)-1,4-dioxaspiro[4.5]dec-8-yl]oxy}(trimethyl)silane (6 g, 27%) with LCMS: 433.1 (M+H+, 100%).

Workup

  1. waitwas sired for 3 hours
  2. stirringstirred at rt for 18 hours
  3. extractionextracted with ethyl acetate (3×50 mL)
  4. washwashed with saline solution (2×50 mL)
  5. dry with materialdried over sodium sulfate
  6. concentrationconcentrated in vacuo
  7. customThe residue was chromatographed on silica gel
  8. washeluting with hexane/ethyl acetate (95/5 to 100/0)

Sources & evidence

ORD record
ord-b7179a3100de4b78aa4a79d86507a684
Source dataset
uspto-grants-2010_11
Patent number
US07834021B2

Reaction notes

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