Sulfuric Acid → HCID 18402914, compound

HRID 1953993Notes

Reaction equation

HRID 1953993 reaction equation
[Cl:1][C:2]1[C:7]([O:8][C:9]2[CH:14]=[CH:13][C:12](N)=[CH:11][CH:10]=2)=[CH:6][C:5]([N:16]2[C:21](=[O:22])[CH:20]=[C:19]([C:23]([F:26])([F:25])[F:24])[NH:18][C:17]2=[O:27])=[C:4]([F:28])[CH:3]=1.S(=O)(=O)(O)[OH:30].N([O-])=O.[Na+].NC(N)=O>O.[Cu-]=O>[Cl:1][C:2]1[C:7]([O:8][C:9]2[CH:14]=[CH:13][C:12]([OH:30])=[CH:11][CH:10]=2)=[CH:6][C:5]([N:16]2[C:21](=[O:22])[CH:20]=[C:19]([C:23]([F:25])([F:24])[F:26])[NH:18][C:17]2=[O:27])=[C:4]([F:28])[CH:3]=1

Participants

7

Reactant 4

HCID 1118Sulfuric AcidHCID 1176UreaHCID 18403007HCID 18403007, compoundHCID 23668193Sodium Nitrite

Product 1

HCID 18402914HCID 18402914, compound

Reagents, catalysts & solvents 2

HCID 178419072HCID 178419072, compoundCatalystHCID 962WaterSolvent2×

Procedure

3-[4-Chloro-2-fluoro-5-(4-aminophenoxy)phenyl]-6-trifluoromethyl-1,2,3,4-tetrahydro-pyrimidine-2,4-dione (2.0 g) was mixed with hot 30% sulfuric acid (5 ml) and ice/water (5.0 g) was added. The mixture kept at 10° C. while a solution of sodium nitrite (0.45 g) in water (5 ml) was slowly introduced at the bottom of the stirred mixture. After stirring for 10 minutes, urea (0.1 g) was added, followed by a solution of copper(2)nitrate (18.0 g) in water (170 ml), and copper(1)oxide (0.7 g). The mixture was stirred for 10 minutes, extracted with diethyl ether (50 ml×3), and dried over sodium sulfate. The crude product was purified by column chromatography (hexane:ethyl acetate, 4:1) to give 3-[4-chloro -2-fluoro-5-(4-hydroxyphenoxy)phenyl]-6-trifluoromethyl-1,2,3,4-tetrahydropyrimidine-2,4-dione (Intermediate 11-31), (1.0 g).

Workup

  1. additionwas added
  2. additionwas slowly introduced at the bottom of the stirred mixture
  3. stirringThe mixture was stirred for 10 minutes
  4. extractionextracted with diethyl ether (50 ml×3)
  5. dry with materialdried over sodium sulfate
  6. customThe crude product was purified by column chromatography (hexane:ethyl acetate, 4:1)

Sources & evidence

ORD record
ord-ac294a1a9be34a479682e4c2aa10b642
Source dataset
uspto-grants-2000_09
Patent number
US06121201

Reaction notes

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