Urea → 5-(2-chlorophenyl)pyrimidine-2,4(1H,3H)-dione

HRID 1766033Notes

Reaction equation

HRID 1766033 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=[CH:13]N(C)C)[C:9](OC)=[O:10].[NH2:17][C:18]([NH2:20])=[O:19].[Na+].[I-].C[Si](Cl)(C)C.[OH-].[Na+]>C(#N)C>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[C:9](=[O:10])[NH:17][C:18](=[O:19])[NH:20][CH:13]=1

Participants

7

Reactant 5

HCID 1176UreaHCID 5238Sodium IodideHCID 6397ChlorotrimethylsilaneHCID 14798Sodium HydroxideHCID 67505122Methyl 2-(2-chlorophenyl)-3-(dimethylamino)acrylate

Product 1

HCID 220644855-(2-chlorophenyl)pyrimidine-2,4(1H,3H)-dioneYield 66.5%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a mixture of methyl 2-(2-chlorophenyl)-3-(dimethylamino)acrylate 2b (0.26 g, 1.08 mmol), urea (0.2 g, 3.26 mmol) and NaI (0.49 g, 3.26 mmol) in acetonitrile (5 mL) was added TMSCl (0.41 mL, 3.26 mmol). The resulting mixture was refluxed for 16 hours, cooled to room temperature, and 1.0 M NaOH (8 mL) was added. The resultant solution was stirred for 20 hr, and acetonitrile was removed in vacuo. The aq. solution was washed with ether, cooled in ice bath, and neutralized with 1 N HCl (8 mL). The precipitate was filtered, washed with additional H2O, and dried to give 5-(2-chlorophenyl)pyrimidine-2,4(1H,3H)-dione 2c (0.16 g, 66%) as a white solid. MS (CI) m/z 222.9, 224.9 (MH+).

Workup

  1. temperatureThe resulting mixture was refluxed for 16 hours
  2. customacetonitrile was removed in vacuo
  3. washThe aq. solution was washed with ether
  4. temperaturecooled in ice bath
  5. filtrationThe precipitate was filtered
  6. washwashed with additional H2O
  7. customdried

Sources & evidence

ORD record
ord-58f4d49257c74d50ade6ce6687bc2504
Source dataset
uspto-grants-2007_06
Patent number
US07229995B2

Reaction notes

Loading…