4,4,4-Trifluoro-1-(4-trifluoromethylphenyl)-1,3-butanedione → 4-Trifluoromethyl-2-(4-trifluoromethyl-phenyl)-imidazo[1,5-a]pyrimidine-8-carboxylic acid ethyl ester

HRID 269012Notes

Reaction equation

HRID 269012 reaction equation
[F:1][C:2]([F:19])([F:18])[C:3](=O)[CH2:4][C:5]([C:7]1[CH:12]=[CH:11][C:10]([C:13]([F:16])([F:15])[F:14])=[CH:9][CH:8]=1)=O.[CH2:20]([O:22][C:23]([C:25]1[N:26]=[CH:27][NH:28][C:29]=1[NH2:30])=[O:24])[CH3:21]>C(O)(=O)C>[CH2:20]([O:22][C:23]([C:25]1[N:26]=[CH:27][N:28]2[C:3]([C:2]([F:19])([F:18])[F:1])=[CH:4][C:5]([C:7]3[CH:12]=[CH:11][C:10]([C:13]([F:16])([F:15])[F:14])=[CH:9][CH:8]=3)=[N:30][C:29]=12)=[O:24])[CH3:21]

Participants

4

Reactant 2

HCID 108590204,4,4-Trifluoro-1-(4-trifluoromethylphenyl)-1,3-butanedioneHCID 178470302HCID 178470302, compound

Product 1

HCID 866080034-Trifluoromethyl-2-(4-trifluoromethyl-phenyl)-imidazo[1,5-a]pyrimidine-8-carboxylic acid ethyl esterYield 43.5%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A mixture of 4,4,4-trifluoro-1-(4-trifluoromethyl-phenyl)-butane-1,3-dione (10.0 g, 35.2 mmol) and 5-amino-1H-imidazole-4-carboxylic acid ethyl ester (5.0 g, 32.2 mmol) in acetic acid (120 mL) was refluxed for 24 h and evaporated. The crude product was further purified by column chromatography on silica gel (ethyl acetate/heptane) and crystallization (diethyl acetate/hexane) to yield 4-trifluoromethyl-2-(4-trifluoromethyl-phenyl)-imidazo[1,5-a]pyrimidine -8-carboxylic acid ethyl ester (5.65 g, 43%) as a yellow solid. MS (EI) 403.1 [(M)+]; mp 243° C.

Workup

  1. temperaturewas refluxed for 24 h
  2. customevaporated
  3. customThe crude product was further purified by column chromatography on silica gel (ethyl acetate/heptane) and crystallization (diethyl acetate/hexane)

Sources & evidence

ORD record
ord-f7ecf8a5bcf64f8e8b562f5b39ce3c06
Source dataset
uspto-grants-2008_11
Patent number
US07446113B2

Reaction notes

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