Reaktion #82716

Reaktionsgleichung

ethyl 4,4,4-trifluoroacetoacetate

1,3-cylohexanedione

3-nitrobenzaldehyde

ammonium acetate

→

3-carboethoxy-2-trifluoromethyl-2-hydroxy-4-(3-nitrophenyl) -4,6,7,8-tetrahydro-5(1H)-quinolone

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas heated
2. 2
   Temperaturat reflux for 4.5 hours
3. 3
   SonstigeAfter removal of solvent the orange residue
4. 4
   workup.ADDITIONwas treated diethyl ether
5. 5
   Filtrationthe resulting precipitate was collected by filtration
6. 6
   SonstigeThe solid was triturated with hot diethyl ether
7. 7
   Sonstigecollected
8. 8
   Sonstigepurified by chromatography (ethyl acetate)

Vorschrift

A stirred mixture of ethyl 4,4,4-trifluoroacetoacetate (6.00 mL), 1,3-cylohexanedione (4.65 g), 3-nitrobenzaldehyde (6.31 g), and ammonium acetate (6.57 g) in ethanol (350 mL) was heated at reflux for 4.5 hours. After removal of solvent the orange residue was treated diethyl ether, and the resulting precipitate was collected by filtration. The solid was triturated with hot diethyl ether, collected, and purified by chromatography (ethyl acetate) to yield 3-carboethoxy-2-trifluoromethyl-2-hydroxy-4-(3-nitrophenyl) -4,6,7,8-tetrahydro-5(1H)-quinolone (8.47 g) as a white solid. NMR: 0.85 (t,3, J=7.1, CH3), 1.86 (m,2, CH2), 2.07 (m,2, CH2), 2.27-2.44 (m, 1, CH2), 2.57-2.72 (m, 1, CH2), 2.75 (d,1, J=11.9, CH), 3.83 (m,2, CH2), 4.07 (d,1, J=11.4, CH), 7.30 (s,1, OH), 7.50 (m, 1, Ar), 7.57 (m,1, Ar), 7.87 (m,1, Ar), 8.01 (m,1, Ar), 8.16 (s,1, NH); MS: m/z=428(M).

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