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Dimethylformamide → (2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-4-[3-(2-methyl-1,3-dioxolan-2-yl)propyl]piperazine

HRID 10169
Notes
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Reaction equation

HRID 10169 reaction equation
[CH2:1]1[O:10][C:4]([CH2:6][CH2:7][CH2:8]Cl)([CH3:5])[O:3][CH2:2]1.[F:11][C:12]([F:42])([F:41])[C:13]1[CH:14]=[C:15]([CH:34]=[C:35]([C:37]([F:40])([F:39])[F:38])[CH:36]=1)[C:16]([N:18]1[CH2:23][CH2:22][NH:21][CH2:20][C@H:19]1[CH2:24][C:25]1[C:33]2[C:28](=[CH:29][CH:30]=[CH:31][CH:32]=2)[NH:27][CH:26]=1)=[O:17].C(N(C(C)C)CC)(C)C.CN(C)C=O>O>[F:40][C:37]([F:38])([F:39])[C:35]1[CH:34]=[C:15]([CH:14]=[C:13]([C:12]([F:11])([F:41])[F:42])[CH:36]=1)[C:16]([N:18]1[CH2:23][CH2:22][N:21]([CH2:8][CH2:7][CH2:6][C:4]2([CH3:5])[O:10][CH2:1][CH2:2][O:3]2)[CH2:20][C@H:19]1[CH2:24][C:25]1[C:33]2[C:28](=[CH:29][CH:30]=[CH:31][CH:32]=2)[NH:27][CH:26]=1)=[O:17]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 800792-(3-Chloropropyl)-2-methyl-1,3-dioxolaneHCID 81531DiisopropylethylamineHCID 10972505(2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)piperazine

Product 1

HCID 58681859(2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-4-[3-(2-methyl-1,3-dioxolan-2-yl)propyl]piperazine
Yield 40%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of 5-chloro-2-pentanone ethylene ketal (0.54 g), (2R)-1-[3,5-bis(trifluoro-methyl)benzoyl]-2-(1H-indol-3-ylmethyl)piperazine (1.37 g), diisopropylethylamine (0.6 mL), and dimethylformamide (25 mL) was heated overnight, at 90°C. After cooling to room temperature the mixture was poured in water and extracted with ethyl acetate. The organic layer was dried (Na2SO4), and concentrated in vacuo. The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH 95/15) to afford (2R)-1-[3,5-bis(trifluoromethyl)benzoyl]-2-(1H-indol-3-ylmethyl)-4-[3-(2-methyl-1,3-dioxolan-2-yl)propyl]piperazine (0.7 g, 40%). MH+ 584.

Workup

  1. temperatureAfter cooling to room temperature the mixture
  2. extractionextracted with ethyl acetate
  3. dry with materialThe organic layer was dried (Na2SO4)
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH 95/15)

Sources & evidence

ORD record
ord-01898ff63c1d4a31a48358210ecd48cd
Source dataset
uspto-grants-2006_08
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07094779B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes