Perchloric Acid → O-(2,4,6-Trimethylbenzenesulfonyl)hydroxylamine

HRID 1094027Notes

Reaction equation

HRID 1094027 reaction equation
CCO/C(/C)=[N:5]\[O:6][S:7]([C:10]1[C:15]([CH3:16])=[CH:14][C:13]([CH3:17])=[CH:12][C:11]=1[CH3:18])(=[O:9])=[O:8].Cl(O)(=O)(=O)=O>O1CCOCC1>[C:11]1([CH3:18])[CH:12]=[C:13]([CH3:17])[CH:14]=[C:15]([CH3:16])[C:10]=1[S:7]([O:6][NH2:5])(=[O:9])=[O:8]

Participants

4

Reactant 2

HCID 24247Perchloric AcidHCID 5748625ethyl (1E)-N-{[(2,4,6-trimethylphenyl)sulfonyl]oxy}ethanimidate

Product 1

HCID 11830845O-(2,4,6-Trimethylbenzenesulfonyl)hydroxylamine

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

An adaptation of the method described in WO 96/01826 was used. To a solution of ethyl O-mesitylsulfonylacetohydroxamate 7 (1.7 g, 6.0 mmol) in 1,4-dioxane (10 mL) cooled in an ice bath (freezes at 8-9° C.) was added 70% perchloric acid (7.5 mL) dropwise over 15 minutes, maintaining internal temperature below 15° C. The mixture was then diluted with ice water (100 mL) to precipitate the product O-(mesitylsulfonyl)hydroxylamine 8 which was filtered off, washed thoroughly with water, and immediately dissolved in chloroform (10 mL) while still wet (CAUTION! 8 is explosive when dry!). The organic layer was separated and was passed through a plug of Na2SO4 in a fritted syringe to remove water. The so obtained solution of O-(mesitylsulfonyl)hydroxylamine 8 was added dropwise to a solution of 2-amino-4,6-dimethylpyridine 9 (0.611 g, 5.00 mmol) in chloroform (10 mL) cooled in an ice bath. The mixture was then warmed to room temperature and was stirred for 2 hours to effect conversion to intermediate 10. Into the reaction mixture was then added 1,1′-thiocarbonyldiimidazole 11 (1.16 g, 6.5 mmol) and the resulting mixture was stirred at 40° C. overnight. Volatiles were evaporated and the residue was chromatographed on silica gel (gradient elution with heptane:ethyl acetate 100:0→0:100) to yield imidazole-1-carbothioic acid (2-imino-4,6-dimethyl-2H-pyridin-1-yl)-amide 12 as an off-white solid (0.50 g, 40%) containing a minor amount of residual imidazole. 1H NMR (500 MHz, DMSO-d6): δ7.88 (s, 1H), 7.64 (s, 1H), 7.42 (br s, 2H), 6.93 (s, 1H), 6.69 (s, 1H), 6.67 (s, 1H), 2.28 (s, 3H), 2.27 (s, 3H).

Workup

  1. temperaturemaintaining internal temperature below 15° C
  2. customto precipitate the product O-(mesitylsulfonyl)hydroxylamine 8 which
  3. filtrationwas filtered off
  4. washwashed thoroughly with water
  5. dissolutionimmediately dissolved in chloroform (10 mL) while still wet (CAUTION! 8 is explosive when dry!)
  6. customThe organic layer was separated
  7. customwas passed through a plug of Na2SO4 in a fritted syringe
  8. customto remove water

Sources & evidence

ORD record
ord-6ed2f73435b549da8e1f1a50288940c4
Source dataset
uspto-grants-2012_03
Patent number
US08133897B2

Reaction notes

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