Dimethylformamide → 4,6-Bis(1,1-dimethylethyl)-5-hydroxy-N-methoxy-N-methyl-2-pyrimidinecarboxamide

HRID 2255404Notes

Reaction equation

HRID 2255404 reaction equation
[CH3:1][C:2]([C:5]1[C:10]([OH:11])=[C:9]([C:12]([CH3:15])([CH3:14])[CH3:13])[N:8]=[C:7]([C:16](O)=[O:17])[N:6]=1)([CH3:4])[CH3:3].CN(C)C=O.C(Cl)(=O)C(Cl)=O.Cl.[CH3:31][NH:32][O:33][CH3:34].CN1CCCCC1>ClCCl>[CH3:15][C:12]([C:9]1[C:10]([OH:11])=[C:5]([C:2]([CH3:4])([CH3:1])[CH3:3])[N:6]=[C:7]([C:16]([N:32]([O:33][CH3:34])[CH3:31])=[O:17])[N:8]=1)([CH3:14])[CH3:13]

Participants

7

Reactant 5

HCID 6228DimethylformamideHCID 12291N-MethylpiperidineHCID 65578Oxalyl chlorideHCID 81138Methanamine, N-methoxy-, hydrochloride (1:1)HCID 152753184,6-Ditert-butyl-5-hydroxy-2-pyrimidinecarboxylic acid

Product 1

HCID 100401704,6-Bis(1,1-dimethylethyl)-5-hydroxy-N-methoxy-N-methyl-2-pyrimidinecarboxamideYield 65.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent3×

Procedure

A mixture of 8.4 g (33 mmol) of 4,6-bis(1,1-dimethylethyl)-5-hydroxy-2-pyrimidinecarboxylic acid and 0.50 mL (0.47 g, 6.5 mmol) of N,N-dimethylformamide in 120 mL of dichloromethane was cooled in ice and treated dropwise with a solution of 4.9 mL (7.1 g, 56 mmol) of oxalyl chloride in 18 mL of dichloromethane. The mixture was stirred with ice cooling for 2 hours, then filtered, and evaporated. The residual crude acid chloride was redissolved in 85 mL of dichloromethane and added dropwise to an ice-cooled mixture of 4.0 g (41 mmol) of N,O-dimethylhydroxylamine hydrochloride and 15 mL (12.2 g, 123 mmol) of 1-methylpiperidine in 150 mL of dichloromethane. The mixture was stirred at room temperature for 16 hours, then washed with 0.4N hydrochloric acid, brine, 5% aqueous sodium bicarbonate, and brine again. The organic layer was dried (anhydrous sodium sulfate) and evaporated, and the residue recrystallized from ethyl acetate/hexane to yield 6.4 g (65%) of the amide product, mp 140° C.-142° C.

Workup

  1. temperaturewas cooled in ice
  2. filtrationfiltered
  3. customevaporated
  4. dissolutionThe residual crude acid chloride was redissolved in 85 mL of dichloromethane
  5. additionadded dropwise to an ice-
  6. temperaturecooled
  7. stirringThe mixture was stirred at room temperature for 16 hours
  8. washwashed with 0.4N hydrochloric acid, brine, 5% aqueous sodium bicarbonate, and brine again
  9. dry with materialThe organic layer was dried (anhydrous sodium sulfate)
  10. customevaporated
  11. customthe residue recrystallized from ethyl acetate/hexane

Sources & evidence

ORD record
ord-afa3bda8082f4dac8a018c1b2f879f85
Source dataset
uspto-grants-1993_08
Patent number
US05240929

Reaction notes

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