Potassium Carbonate → 1-Ethynyl-3-methanesulfonylbenzene

HRID 1673013Notes

Reaction equation

HRID 1673013 reaction equation
[CH3:1][S:2]([C:5]1[CH:6]=[C:7]([C:11]#[C:12][Si](C)(C)C)[CH:8]=[CH:9][CH:10]=1)(=[O:4])=[O:3].C(=O)([O-])[O-].[K+].[K+]>CO>[C:11]([C:7]1[CH:8]=[CH:9][CH:10]=[C:5]([S:2]([CH3:1])(=[O:3])=[O:4])[CH:6]=1)#[CH:12]

Participants

4

Reactant 2

HCID 11430Potassium CarbonateHCID 59240077[2-(3-Methanesulfonylphenyl)ethynyl]trimethylsilane

Product 1

HCID 205151451-Ethynyl-3-methanesulfonylbenzene

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

The TMS-acetylene 1.58 g (626 μmol) was treated with 1.02 g of potassium carbonate and 10.0 mL of methanol. The resulting suspension was stirred at room temperature for 3 h then was concentrated to remove methanol. The residue was washed into a separatory funnel with ethyl acetate and water. The ethyl acetate was separated, washed with ammonium chloride, brine, was dried (Na2SO4), and concentrated in vacuo. The residue was purified by silica gel flash chromatography (Jones Flashmaster, 50 g Silica gel, gradient elution from 100% hexanes to 40% ethyl acetate over 30 minutes). Appropriate fractions were combined and concentrated in vacuo affording 1-Ethynyl-3-methanesulfonyl-benzene as a cream colored solid, yield: 977 mg (86.6%). 1H NMR (CDCl3): δ 8.07 (s, 1H), 7.92 (d, J=8 Hz, 1H), 7.75 (d, J=8 Hz, 1H), 7.55 (t, J=8 Hz, 1H), 3.22 (s, 1H), 3.06 (s, 3H).

Workup

  1. concentrationthen was concentrated
  2. customto remove methanol
  3. washThe residue was washed into a separatory funnel with ethyl acetate and water
  4. customThe ethyl acetate was separated
  5. washwashed with ammonium chloride, brine
  6. dry with materialwas dried (Na2SO4)
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by silica gel flash chromatography (Jones Flashmaster, 50 g Silica gel, gradient elution from 100% hexanes to 40% ethyl acetate over 30 minutes)
  9. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-07e83e1e57ed4aff8789e69dd95891c3
Source dataset
uspto-grants-2011_08
Patent number
US07998995B2

Reaction notes

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