Phosphorus sulfide (P2S5) → 3,4-dihydro-6-(3,4-dimethoxyphenyl)-1,3-dimethyl-4-thioxo-2(1H)-pyrimidinone

HRID 1253067Notes

Reaction equation

HRID 1253067 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]2[N:16]([CH3:17])[C:15](=[O:18])[N:14]([CH3:19])[C:13](=O)[CH:12]=2)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:22]>N1C=CC=CC=1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]2[N:16]([CH3:17])[C:15](=[O:18])[N:14]([CH3:19])[C:13](=[S:22])[CH:12]=2)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10]

Participants

4

Reactant 2

HCID 14817Phosphorus sulfide (P2S5)HCID 140964656-(3,4-dimethoxyphenyl)-1,3-dimethyl-2,4(1H,3H)-pyrimidinedione

Product 1

HCID 140964773,4-dihydro-6-(3,4-dimethoxyphenyl)-1,3-dimethyl-4-thioxo-2(1H)-pyrimidinoneYield 95.1%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

A mixture of 6-(3,4-dimethoxyphenyl)-1,3-dimethyl-2,4(1H,3H)-pyrimidinedione (1.57 g) and phosphorus pentasulfide (3.3 g) in pyridine was refluxed for 15 hours with stirring. The reaction mixture was evaporated under reduced pressure. The residue was washed with 1N-hydrochloric acid and extracted with dichloromethane. The extract was washed with water, dried over magnesium sulfate and evaporated under reduced pressure. The residue was triturated in diisopropyl ether to give 3,4-dihydro-6-(3,4-dimethoxyphenyl)-1,3-dimethyl-4-thioxo-2(1H)-pyrimidinone (1.58 g).

Workup

  1. temperaturewas refluxed for 15 hours
  2. customThe reaction mixture was evaporated under reduced pressure
  3. washThe residue was washed with 1N-hydrochloric acid
  4. extractionextracted with dichloromethane
  5. washThe extract was washed with water
  6. dry with materialdried over magnesium sulfate
  7. customevaporated under reduced pressure
  8. customThe residue was triturated in diisopropyl ether

Sources & evidence

ORD record
ord-754f6b87a106429f8552eb0788b41606
Source dataset
uspto-grants-1988_05
Patent number
US04746664

Reaction notes

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