1-Methylpiperazine → 4-(4-Methylpiperazin-1-yl)-3-(trifluoromethyl)benzonitrile
Reaction equation
Br[C:2]1[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[CH:4][C:3]=1[C:10]([F:13])([F:12])[F:11].[CH3:14][N:15]1[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]1>CN(C)C(=O)C>[CH3:14][N:15]1[CH2:20][CH2:19][N:18]([C:2]2[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[CH:4][C:3]=2[C:10]([F:13])([F:12])[F:11])[CH2:17][CH2:16]1Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 95 °C
Procedure
A mixture of 4-bromo-3-(trifluoromethyl)-benzonitrile (Yonezawa et al., Synthetic Communications (1996) 26, 1575-8; 2.47 g, 12 mmol), 1-methylpiperazine (Fluka, Buchs, Switzerland, 5.33 mL, 48 mmol) and 15 mL N,N-dimethylacetamide is stirred in a tightly closed vessel for 14 hours at 95° C. After cooling, the reaction mixture is evaporated to dryness under reduced pressure and the residue is treated with a half-saturated aqueous solution of sodium carbonate and extracted with ethyl acetate. The combined extracts are dried (Na2SO4) and the solvent is evaporated off under reduced pressure. The crude product is purified by column chromatography on silica gel, eluent methylene chloride/methanol to give 4-(4-methyl-1-piperazinyl)-3-(trifluoromethyl)-benzonitrile as a pale yellow oil.
Workup
- temperatureAfter cooling
- customthe reaction mixture is evaporated to dryness under reduced pressure
- additionthe residue is treated with a half-saturated aqueous solution of sodium carbonate
- extractionextracted with ethyl acetate
- dry with materialThe combined extracts are dried (Na2SO4)
- customthe solvent is evaporated off under reduced pressure
- customThe crude product is purified by column chromatography on silica gel, eluent methylene chloride/methanol
Sources & evidence
- ORD record
- ord-28c9b49de23044b7af1f818f40115560
- Source dataset
- uspto-grants-2010_02
- Patent number
- US07655669B2
Reaction notes
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