5,6,7,8-TETRAHYDROQUINOLINONE-5 Chemical Properties

Boiling point:

116-117 °C(Press: 6 Torr)

Density 

1.168±0.06 g/cm3(Predicted)

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

solubility 

Chloroform (Sparingly), Methanol (Slightly)

pka

3.85±0.20(Predicted)

form 

liquid

color 

Yellow-brown

InChI

InChI=1S/C9H9NO/c11-9-5-1-4-8-7(9)3-2-6-10-8/h2-3,6H,1,4-5H2

InChIKey

YHHBKPWMEXGLKE-UHFFFAOYSA-N

SMILES

N1C2=C(C(=O)CCC2)C=CC=1

Safety Information

HS Code 

2933499090

5,6,7,8-TETRAHYDROQUINOLINONE-5 Usage And Synthesis

Uses

7,8-Dihydro-5(6H)-quinolone is used as a reagent in the synthesis of pyridino N-alkylated nicotine analogs which can serve as nicotinic acetylcholine receptor antagonists. 7,8-Dihydro-5(6H)-quinolone is also used in the total synthesis of (±)-tangutorine, a novel indole alkaloid.

Synthesis

The general procedure for the synthesis of 5,6,7,8-tetrahydroquinolin-5-one from 5,6,7,8-tetrahydroquinoline was as follows: 0.883 mg of Mn(OTf)2 (0.5 mol%), 67 mg of 5,6,7,8-tetrahydroquinoline, 0.35 g of 65% aqueous TBHP and 2.5 mL of water were added sequentially to 25 mL of a round bottomed flask. The reaction mixture was stirred in air at room temperature for 24 hours. Upon completion of the reaction, the reaction solution was extracted with ethyl acetate (3 x 5 mL), the organic phases were combined and dried over anhydrous sodium sulfate. After filtration, the solvent was removed by concentration under reduced pressure. The crude product was purified by silica gel column chromatography using petroleum ether with ethyl acetate (5:1, v/v) as eluent to afford the target compound 5,6,7,8-tetrahydroquinolin-5-one (56.6 mg, 77% yield) as a pale yellow liquid.

References

[1] Patent: CN105669548, 2016, A. Location in patent: Paragraph 0029; 0030

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