Dimethylformamide → Ethyl 7-Chloropyrimido[4,5-b]quinolin-4(3H)-one-2-carboxylate

HRID 2163584Notes

Reaction equation

HRID 2163584 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[C:7]([NH2:12])[C:6]([C:13]([NH2:15])=[O:14])=[CH:5]2.[H-].[Na+].CN(C)C=O.[C:23](OCC)(=O)[C:24]([O:26][CH2:27][CH3:28])=[O:25]>O.C(O)(=O)C>[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[C:7]1[N:12]=[C:23]([C:24]([O:26][CH2:27][CH3:28])=[O:25])[NH:15][C:13](=[O:14])[C:6]1=[CH:5]2

Participants

7

Reactant 4

HCID 6228Dimethylformamide2×HCID 7268Diethyl OxalateHCID 24758Sodium hydride2×HCID 12594648HCID 12594648, compound

Product 1

HCID 135705337Ethyl 7-Chloropyrimido[4,5-b]quinolin-4(3H)-one-2-carboxylate

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 962WaterSolvent

Procedure

A mixture of 6-chloro-2-aminoquinoline-3-carboxamide (2.2 g., 0.01 mole), sodium hydride (0.52 g., 0.012 mole as 56% dispersion in oil) and N,N-dimethylformamide (20 ml.) is added to a solution of diethyl oxalate (5 ml.) and N,N-dimethylformamide (5 ml.). The reaction mixture is stirred for fifteen minutes, a second portion of sodium hydride (0.52 g., 0.012 mole) added and stirring continued for an additional fifteen minutes. Acetic acid (25.0 ml.) is cautiously added to the mixture followed by water (50 ml.). The tan precipitate is removed by filtration and dried (2.0 g. of crude ester). It is purified by chromatography on silica gel using chloroform:2B ethanol (99:1) as eluant. The product, recovered by concentration of the eluate, is recrystallized from acetic acid. Yield = 1.3 g. (37.3%). M.P. 260.5° C. (dec.). Mass spectra gave m/e = 303.

Workup

  1. stirringstirring
  2. waitcontinued for an additional fifteen minutes
  3. customThe tan precipitate is removed by filtration
  4. dry with materialdried (2.0 g. of crude ester)
  5. customIt is purified by chromatography on silica gel
  6. customThe product, recovered by concentration of the eluate,
  7. customis recrystallized from acetic acid
  8. customMass spectra gave m/e = 303

Sources & evidence

ORD record
ord-20ae5aba1cec4a36abae2ef217740b46
Source dataset
uspto-grants-1979_01
Patent number
US04134981

Reaction notes

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