Piperazine → HCID 58425618, compound

HRID 1966442Notes

Reaction equation

HRID 1966442 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]([N+:15]([O-:17])=[O:16])=[C:6]([NH:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[CH:7]=1.[NH:18]1[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1>CN1C(=O)CCC1>[N+:15]([C:5]1[CH:4]=[CH:3][C:2]([N:18]2[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]2)=[CH:7][C:6]=1[NH:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1)([O-:17])=[O:16]

Participants

4

Reactant 2

HCID 4837PiperazineHCID 2386965-bromo-2-nitro-n-phenylaniline

Product 1

HCID 58425618HCID 58425618, compoundYield 86.3%

Reagents, catalysts & solvents 1

HCID 13387N-methyl-2-pyrrolidoneSolvent

Procedure

A solution of 5-bromo-2-nitro-N-phenylbenzenamine (4.0 g, 13.6 mmol) and piperazine (4.7 g, 54.6 mmol) in 40 ml NMP was heated at 100° C. for 16 hours. The reaction was quenched with 100 ml water. The mixture was extracted with ethyl acetate (3×30 ml) and dried over anhydrous sodium sulfate. 2-Nitro-N-phenyl-5-(piperazin-1-yl)benzenamine (3.5 g, 86%) was obtained by flash column chromatograph (10% methanol in dichoromethane). A solution of 2-nitro-N-phenyl-5-(piperazin-1-yl)benzenamine (0.5 g, 1.7 mmol), benzyl bromide (0.2 g, 1.7 mmol) and triethylamine (0.60 ml, 4.19 mmol) in 20 ml dichloromethane was stirred at 0° C. for 2 hours. The mixture was washed with water (2×10 ml) and dried over anhydrous sodium sulfate before removing the solvents. N-(5-(4-benzylpiperazin-1-yl)-2-nitrophenyl)benzenamine (0.30 g, 43%) was obtained by flash column chromatograph (50% ethyl acetate in hexanes). 1H NMR (500 MHz, CDCl3) δ (ppm) 2.54 (t, J=5.0 Hz, 4H), 3.32 (t, J=2.0 Hz, 4H), 3.56 (s, 2H), 6.34 (dd, J=9.7, 2.1 Hz, 1H), 6.42 (d, J=2.5 Hz, 1H), 7.22-7.44 (m, 9H), 8.14 (d, J=9.7 Hz, 1H), 9.90 (s, 1H). 13C NMR (125 MHz, CDCl3): δ (ppm) 47.3, 53.0, 63.3, 96.2, 106.2, 124.9, 125.8, 127.8, 128.9, 129.3, 129.6, 130.1, 138.0, 139.5, 145.9, 156.1.

Workup

  1. customThe reaction was quenched with 100 ml water
  2. extractionThe mixture was extracted with ethyl acetate (3×30 ml)
  3. dry with materialdried over anhydrous sodium sulfate

Sources & evidence

ORD record
ord-3c86a8215d2c4c9f8e16dd1ed923e58b
Source dataset
uspto-grants-2013_04
Patent number
US08420640B2

Reaction notes

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