Acetic Acid → 5-(2-Fluoro-5-methoxybenzylidene)-2-thioxo-1,3-thiazolidin-4-one

HRID 2220296Notes

Reaction equation

HRID 2220296 reaction equation
[F:1][C:2]1[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[CH:6][C:3]=1[CH:4]=O.[S:12]1[CH2:18][C:16](=[O:17])[NH:15][C:13]1=[S:14].C(O)(=O)C>C1(C)C=CC=CC=1.C([O-])(=O)C.[NH4+]>[F:1][C:2]1[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[CH:6][C:3]=1[CH:4]=[C:18]1[S:12][C:13](=[S:14])[NH:15][C:16]1=[O:17]

Participants

6

Reactant 3

HCID 176Acetic AcidHCID 1201546RhodanineHCID 27348722-Fluoro-5-methoxybenzaldehyde

Product 1

HCID 850594845-(2-Fluoro-5-methoxybenzylidene)-2-thioxo-1,3-thiazolidin-4-oneYield 91.5%

Reagents, catalysts & solvents 2

HCID 517165Ammonium AcetateCatalystHCID 1140TolueneSolvent

Conditions

Temperature
120 °C

Procedure

To a suspension of 2-fluoro-5-methoxybenzaldehyde (5.00 g, 32.46 mmol) and rhodanine (4.31 g, 32.46 mmol) in dry toluene (1000 mL) was added ammonium acetate (50 mg) and acetic acid (2 mL). The resulting suspension was allowed to stir at 120° C. for 12 h under Dean-Stark apparatus before being allowed to cool and filtered. Resultant solid was washed with hexane and allowed to dry in vacuo to give an orange crystalline solid (8.00 g, 91%); δH (300 MHz, CDCl3) 7.50 (1H, s, CH═C); 7.31 (1H, t, Ar), 7.20-7.11 (1H, m, Ar), 6.95-6.89 (1H, m, Ar), 3.80 (3H, s, OCH3).

Workup

  1. temperatureto cool
  2. filtrationfiltered
  3. washResultant solid was washed with hexane
  4. customto dry in vacuo

Sources & evidence

ORD record
ord-c0ea1f71ddd34af3af91c9aaf33b5921
Source dataset
uspto-grants-2008_08
Patent number
US07417064B2

Reaction notes

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