Triethylamine → 1-[3,5-Bis(trifluoromethyl)benzoyl]-4-(benzyloxycarbonyl)-2-(2,3-dimethoxybenzyl)piperazine

HRID 584247Notes

Reaction equation

HRID 584247 reaction equation
[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][NH:14][CH:13]([CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[C:20]([O:24][CH3:25])[C:19]=2[O:26][CH3:27])[CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(N(CC)CC)C.[F:35][C:36]([F:51])([F:50])[C:37]1[CH:38]=[C:39]([CH:43]=[C:44]([C:46]([F:49])([F:48])[F:47])[CH:45]=1)[C:40](Cl)=[O:41].C(=O)([O-])O.[Na+]>ClCCl.O>[F:35][C:36]([F:50])([F:51])[C:37]1[CH:38]=[C:39]([CH:43]=[C:44]([C:46]([F:49])([F:47])[F:48])[CH:45]=1)[C:40]([N:14]1[CH2:15][CH2:16][N:11]([C:9]([O:8][CH2:1][C:2]2[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=2)=[O:10])[CH2:12][CH:13]1[CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[C:20]([O:24][CH3:25])[C:19]=1[O:26][CH3:27])=[O:41]

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 1018563,5-Bis(trifluoromethyl)benzoyl chlorideHCID 516892Sodium BicarbonateHCID 223427101-(Benzyloxycarbonyl)-3-(2,3-dimethoxybenzyl)piperazine

Product 1

HCID 223428761-[3,5-Bis(trifluoromethyl)benzoyl]-4-(benzyloxycarbonyl)-2-(2,3-dimethoxybenzyl)piperazineYield 78.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6344DichloromethaneSolvent3×

Procedure

To a mixed solution of 1-(benzyloxycarbonyl)-3-(2,3-dimethoxybenzyl)piperazine (0.65 g) and triethylamine (0.293 ml) in dichloromethane (17 ml) was added dropwise a solution of 3,5-bis(trifluoromethyl)benzoyl chloride (0.534 g) in dichloromethane (2.5 ml) under ice-cooling. After being stirred at the same temperature for 2 hours, the reaction mixture was poured into a mixed solvent of water (40 ml) and dichloromethane (25 ml) and the whole was adjusted to pH 9 with aqueous sodium hydrogen carbonate solution. The organic layer was separated, washed with brine, dried over sodium sulfate and evaporated under reduced pressure. The residue was purified by column chromatography on silica gel (10 g) using a mixed solvent of n-hexane and ethyl acetate (2:1). The fractions containing the objective compound were collected and evaporated under reduced pressure to give 1-[3,5-bis(trifluoromethyl)benzoyl]-4-(benzyloxycarbonyl)-2-(2,3-dimethoxybenzyl)piperazine (0.84 g).

Workup

  1. temperaturecooling
  2. customThe organic layer was separated
  3. washwashed with brine
  4. dry with materialdried over sodium sulfate
  5. customevaporated under reduced pressure
  6. customThe residue was purified by column chromatography on silica gel (10 g)
  7. additionThe fractions containing the objective compound
  8. customwere collected
  9. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-ee504507289b406cbeb36f0e666bd734
Source dataset
uspto-grants-2005_08
Patent number
US06924278B2

Reaction notes

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