Sodium Dithionite → 5,6-diamino-1-benzylpyrimidine-2,4(1H,3H)-dione

HRID 489473Notes

Reaction equation

HRID 489473 reaction equation
[NH2:1][C:2]1[N:7]([CH2:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[C:6](=[O:15])[NH:5][C:4](=[O:16])[C:3]=1[N:17]=O.S(S([O-])=O)([O-])=O.[Na+].[Na+]>N>[NH2:17][C:3]1[C:4](=[O:16])[NH:5][C:6](=[O:15])[N:7]([CH2:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[C:2]=1[NH2:1]

Participants

4

Reactant 2

HCID 24489Sodium DithioniteHCID 33071146-amino-1-benzyl-5-nitrosopyrimidine-2,4(1H,3H)-dione

Product 1

HCID 107520325,6-diamino-1-benzylpyrimidine-2,4(1H,3H)-dione

Reagents, catalysts & solvents 1

HCID 222AmmoniaSolvent

Procedure

To a solution of 6-amino-5-nitroso-1-benzyl-1,3-dihydropyrimidine-2,4-dione (1.15 g, 4.7 mmol) in 12.5% aqueous ammonia (40 ml) at 70° C. was added sodium hydrosulfite (2.44 g, 14 mmol) in portions over 15 minutes. On cooling the reaction mixture in an ice bath the product precipitated out. It was filtered, washed with water, and dried under reduced pressure, to provide 5,6-diamino-1-benzyl-1,3-dihydropyrimidine-2,4-dione, a compound of formula (21).

Workup

  1. temperatureOn cooling the reaction mixture in an ice bath the product
  2. customprecipitated out
  3. filtrationIt was filtered
  4. washwashed with water
  5. customdried under reduced pressure

Sources & evidence

ORD record
ord-a7e4c3aad2414bdf975216a78a0b0d32
Source dataset
uspto-grants-2005_12
Patent number
US06977300B2

Reaction notes

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