1-(2,3-Dichlorophenyl)piperazine → 7-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butoxy)-3,4-dihydro-1,8-naphthyridin-2(1H)-one

HRID 1373529Notes

Reaction equation

HRID 1373529 reaction equation
[O:1]=[C:2]1[NH:11][C:10]2[N:9]=[C:8]([O:12][CH2:13][CH2:14][CH2:15][CH:16]=O)[CH:7]=[CH:6][C:5]=2[CH2:4][CH2:3]1.[Cl:18][C:19]1[C:24]([Cl:25])=[CH:23][CH:22]=[CH:21][C:20]=1[N:26]1[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]1.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>ClC(Cl)C>[Cl:18][C:19]1[C:24]([Cl:25])=[CH:23][CH:22]=[CH:21][C:20]=1[N:26]1[CH2:31][CH2:30][N:29]([CH2:16][CH2:15][CH2:14][CH2:13][O:12][C:8]2[N:9]=[C:10]3[C:5]([CH2:4][CH2:3][C:2](=[O:1])[NH:11]3)=[CH:6][CH:7]=2)[CH2:28][CH2:27]1

Participants

5

Reactant 3

HCID 8518331-(2,3-Dichlorophenyl)piperazineHCID 5049666Sodium triacetoxyborohydrideHCID 210733774-((7-Oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)oxy)butanal

Product 1

HCID 112130627-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butoxy)-3,4-dihydro-1,8-naphthyridin-2(1H)-oneYield 61%

Reagents, catalysts & solvents 1

HCID 63651,1-DichloroethaneSolvent

Procedure

In the final step of the synthesis reaction, the title compound, 7-{4-[4-(2,3-Dichloro-phenyl)-piperazin-1-yl]-butoxy}-3,4-dihydro-1H-[1,8]naphthyridin-2-one was produced as follows: To a solution of 4-(7-oxo-5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yloxy)-butyraldehyde (1.06 g, crude from previous reaction) was added a solution of 2,3-dichlorophenylpiperazine (1.02 g, 4.40 mmol) in dichloroethane (5 mL). The solution was stirred for 15 min and NaBH(OAc)3 (1.21 g, 5.72 mmol, 1.3 equiv) was added as a powder. The reaction was stirred at room temperature for 3 h and quenched with saturated NaHCO3 and H2O. The mixture was extracted with EtOAc. The organic layer was washed with saturated NaHCO3, H2O and brine, dried over Na2SO4 and concentrated to give a yellow foam/oil. Purification by liquid chromatography (4% MeOH/CH2Cl2) afforded the title compound as a white foam (1.20 g, 2.67 mmol, 61% over 2 steps). The HCl salt was formed by dissolving the title compound (800 mg, 1.78 mmol) in Et2O (20 mL) and CH2Cl2 (2 mL) followed by the addition of 1N HCl in Et2O (1.75 mL). The resulting white precipitate was collected by filtration, washed with Et2O and dried to give a white solid (801 mg). MS: APCI: M+1: 449.1 (Exact Mass: 448.14).

Workup

  1. stirringThe reaction was stirred at room temperature for 3 h
  2. customquenched with saturated NaHCO3 and H2O
  3. extractionThe mixture was extracted with EtOAc
  4. washThe organic layer was washed with saturated NaHCO3, H2O and brine
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated
  7. customto give a yellow foam/oil
  8. customPurification by liquid chromatography (4% MeOH/CH2Cl2)

Sources & evidence

ORD record
ord-ea047290823c4463822d7e869cb8f765
Source dataset
uspto-grants-2007_01
Patent number
US07160888B2

Reaction notes

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