Water → ethyl 4-oxo-10-(3-cyclopentylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylate

HRID 1719967Notes

Reaction equation

HRID 1719967 reaction equation
[NH2:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([NH:12][C:13](=[O:21])[CH2:14][CH2:15][CH:16]3[CH2:20][CH2:19][CH2:18][CH2:17]3)[CH:10]=2)[N:5]=[CH:4][N:3]=1.C([O:24][CH:25]=[C:26]([C:32](OCC)=O)[C:27]([O:29][CH2:30][CH3:31])=[O:28])C.O>CN(C)C=O>[O:24]=[C:25]1[N:3]2[CH:4]=[N:5][C:6]3[CH:7]=[CH:8][C:9]([NH:12][C:13](=[O:21])[CH2:14][CH2:15][CH:16]4[CH2:20][CH2:19][CH2:18][CH2:17]4)=[CH:10][C:11]=3[C:2]2=[N:1][CH:32]=[C:26]1[C:27]([O:29][CH2:30][CH3:31])=[O:28]

Participants

5

Reactant 3

HCID 962WaterHCID 6871Diethyl (ethoxymethylene)malonateHCID 130604654-Amino-6-(3-cyclopentylpropionamido)quinazoline

Product 1

HCID 13060563ethyl 4-oxo-10-(3-cyclopentylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylateYield 38%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 4-amino-6-(3-cyclopentylpropionamido)-quinazoline (4.4 g) and diethyl ethoxymethylenepropanedioate (5.5 g) in N,N-dimethylformamide (20 ml) was stirred at 100° C. for 3 hours. To the reaction mixture was added water. The resulting crystals were collected by filtration, washed with water, and suspended in dichloroethane under heating. After the suspension was cooled to ambient temperature, the resulting crystals were collected by filtration and washed wit dichloromethane. There was obtained ethyl 4-oxo-10-(3-cyclopentylpropionamido)-4H-pyrimido[1,2-C]-quinazoline-3-carboxylate (2.4 g). The filtrate was concentrated to 1/4 of its original volume and cooled to 0° C. to yield an additional 0.37 g of the same product. The cryde substance (2.77 g) obtained above was chromatographed on silica gel with 2% methanol-dichloromethane. The product was recrystallized from a mixture of methanol and dichloromethane to give crystalline pure product (2.45 g).

Workup

  1. filtrationThe resulting crystals were collected by filtration
  2. washwashed with water
  3. temperatureunder heating
  4. temperatureAfter the suspension was cooled to ambient temperature
  5. filtrationthe resulting crystals were collected by filtration
  6. washwashed wit dichloromethane

Sources & evidence

ORD record
ord-9166bef1a4904d3ea91107c5e36f47e1
Source dataset
uspto-grants-1985_09
Patent number
US04543356

Reaction notes

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