Piperazine → HCID 59699580, compound

HRID 901230Notes

Reaction equation

HRID 901230 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:24])[N:8]([CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C:9]2[C:14]([C:15]=1Cl)=[CH:13][CH:12]=[CH:11][N:10]=2)=[O:5])[CH3:2].[NH:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1>ClCCl>[CH2:1]([O:3][C:4]([C:6]1[C:7](=[O:24])[N:8]([CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C:9]2[C:14]([C:15]=1[N:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1)=[CH:13][CH:12]=[CH:11][N:10]=2)=[O:5])[CH3:2]

Participants

4

Reactant 2

HCID 4837PiperazineHCID 59699571HCID 59699571, compound

Product 1

HCID 59699580HCID 59699580, compoundYield 82%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of 1-benzyl-4-chloro-2-oxo-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic acid ethyl ester (4) (1.2 g, 3.5 mmol) in dichloromethane was added slowly to a stirred solution of piperazine (0.9 g, 10.5 mmol) in dichloromethane at room temperature. The solution was stirred overnight at room temperature. The solvent was evaporated and the residue was suspended in water, sonicated briefly, and extracted with dichloromethane. The combined organic phase was subsequently washed by water and brine, dried over Na2SO4, and evaporated to yield 1.12 g (82%) of 1-benzyl-2-oxo-4-piperazin-1-yl-1,2-dihydro-[1,8]-naphthyridine-3-carboxylic acid ethyl ester (5) as yellow solids. MP: 120° C.; 1H-NMR (DMSO-d6): δ 1.30 (t, J=6.9 Hz, 3H), 2.28 (m, 4H), 3.03 (m, 4H), 4.28 (q, J=6.9 Hz, 2H), 5.55 (s, 2H), 7.16-7.28 (m, 5H), 7.36 (m, 1H), 8.25 (dd, J=1.5, 7.5 Hz, 1H), 8.63 (dd, J=1.5, 7.5 Hz, 1H); EIMS: 393 (M+1), 415 (M+23).

Workup

  1. customThe solvent was evaporated
  2. customsonicated briefly
  3. extractionextracted with dichloromethane
  4. washThe combined organic phase was subsequently washed by water and brine
  5. dry with materialdried over Na2SO4
  6. customevaporated

Sources & evidence

ORD record
ord-09c42ebc155c417f845f664aece50f6d
Source dataset
uspto-grants-2008_04
Patent number
US07361760B2

Reaction notes

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