Trifluoroacetic anhydride → HCID 22394204, compound

HRID 1419089Notes

Reaction equation

HRID 1419089 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:11]=[CH:12][CH:13]=1)[CH2:5][S:6][CH2:7][C:8](O)=[O:9].FC(F)(F)C(OC(=O)C(F)(F)F)=O.C([O-])([O-])=O.[Na+].[Na+]>FC(F)(F)C(O)=O>[Cl:1][C:2]1[CH:3]=[C:4]2[C:11]([C:8](=[O:9])[CH2:7][S:6][CH2:5]2)=[CH:12][CH:13]=1

Participants

5

Reactant 3

HCID 9845Trifluoroacetic anhydrideHCID 10340Sodium CarbonateHCID 2115231{[(3-Chlorophenyl)methyl]sulfanyl}acetic acid

Product 1

HCID 22394204HCID 22394204, compoundYield 51.1%

Reagents, catalysts & solvents 1

HCID 6422Trifluoroacetic acidSolvent

Procedure

3-Chlorobenzylmercaptoacetic acid (Step 2) (3.35 g) was dissolved in trifluoroacetic acid (50 mL). Trifluoroacetic acid anhydride (25 mL) was added and the reaction was heated at reflux, under nitrogen, for 16 hours. The solution was carefully poured into 10% Na2CO3 solution (500 mL) which was stirring vigorously. The organics were extracted into ether (500 mL) and washed with brine (300 mL), dried over MgSO4 and concentrated in vacuo. The resulting brown solid was purified by SiO2 chromatography, eluting with a 0-10% gradient of ethyl acetate in hexane to yield 7-chloroisothiochroman-4-one, (1.57 g, 51%): 1H NMR (CDCl3 300 MHz) 3.49 (d, 2H, J=0.8 Hz), 3.8 (s, 2H), 7.16 (m, 1H), 7.3 (dd, 1H, J=2.0, 8.4 Hz), 7.96 (d, 1H, J=8.5 Hz).

Workup

  1. temperaturethe reaction was heated
  2. temperatureat reflux, under nitrogen, for 16 hours
  3. extractionThe organics were extracted into ether (500 mL)
  4. washwashed with brine (300 mL)
  5. dry with materialdried over MgSO4
  6. concentrationconcentrated in vacuo
  7. customThe resulting brown solid was purified by SiO2 chromatography
  8. washeluting with a 0-10% gradient of ethyl acetate in hexane

Sources & evidence

ORD record
ord-648b8df8353c47bc85acac9c1477257b
Source dataset
uspto-grants-1999_03
Patent number
US05886016

Reaction notes

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