Triethylamine → 3-Amino-5-methoxy-1-quinolin-8-ylpyridazin-4(1H)-one

HRID 2089807Notes

Reaction equation

HRID 2089807 reaction equation
[CH3:1][O:2][C:3]1[C:4](=[O:22])[C:5](C(O)=O)=[N:6][N:7]([C:9]2[CH:10]=[CH:11][CH:12]=[C:13]3[C:18]=2[N:17]=[CH:16][CH:15]=[CH:14]3)[CH:8]=1.C1C=CC(P([N:37]=[N+]=[N-])(C2C=CC=CC=2)=O)=CC=1.CCN(CC)CC.[OH-].[Na+]>C1(C)C=CC=CC=1.CN(C=O)C>[NH2:37][C:5]1[C:4](=[O:22])[C:3]([O:2][CH3:1])=[CH:8][N:7]([C:9]2[CH:10]=[CH:11][CH:12]=[C:13]3[C:18]=2[N:17]=[CH:16][CH:15]=[CH:14]3)[N:6]=1

Participants

7

Reactant 4

HCID 8471Triethylamine2×HCID 14798Sodium HydroxideHCID 199401P,P-Diphenylphosphinic azide2×HCID 59436192HCID 59436192, compound

Product 1

HCID 594362123-Amino-5-methoxy-1-quinolin-8-ylpyridazin-4(1H)-oneYield 20.5%

Reagents, catalysts & solvents 2

HCID 1140TolueneSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 5-methoxy-4-oxo-1-quinolin-8-yl-1,4-dihydropyridazine-3-carboxylic acid (2.59 g, 8.71 mmol), DPPA (2.81 mL, 13.1 mmol) and Et3N (1.82 mL, 13.1 mmol) in toluene (26 mL) was heated to reflux for 1 h. To the suspension were added DMF (52 mL), DPPA (2.81 mL, 13.1 mmol) and Et3N (1.82 mL, 13.1 mmol) at room temperature. The mixture was heated to 100° C. for 1.5 h. To the mixture was added 8 M NaOH aqueous solution (10.9 mL) at 0° C. The mixture was stirred at room temperature for 1.5 h, extracted with EtOAc, dried over Na2SO4, filtered, concentrated in vacuo, purified by column chromatography on basic silica gel (hexane/EtOAc=50/50 to 0/100 and EtOAc/MeOH=100/0 to 80/20) and on silica gel (EtOAc/MeOH=100/0 to 50/50) and triturated with EtOAc/hexane to yield the title compound (479 mg, 20% yield) as a pale yellow solid: 1H NMR (DMSO-d6, 300 MHz): δ ppm 3.75 (3H, s), 6.11 (2H, s), 7.67 (1H, dd, J=8.5, 4.4 Hz), 7.72-7.80 (1H, m), 7.99 (1H, dd, J=7.6, 1.5 Hz), 8.12 (1H, dd, J=8.3, 1.1 Hz), 8.48-8.61 (2H, m), 8.99 (1H, dd, J=4.4, 1.7 Hz).

Workup

  1. temperaturewas heated
  2. temperatureto reflux for 1 h
  3. extractionextracted with EtOAc
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. custompurified by column chromatography on basic silica gel (hexane/EtOAc=50/50 to 0/100 and EtOAc/MeOH=100/0 to 80/20) and on silica gel (EtOAc/MeOH=100/0 to 50/50)
  8. customtriturated with EtOAc/hexane

Sources & evidence

ORD record
ord-ccafc45b020b469fada68b48aa75b0e7
Source dataset
uspto-grants-2013_05
Patent number
US08435995B2

Reaction notes

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