6,7-Dihydro-5H-quinolin-8-one Chemical Properties

Melting point:

96-98 °C(Solv: isopropyl ether (108-20-3))

Boiling point:

140 °C(Press: 0.1 Torr)

Density 

1.168±0.06 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

solubility 

DMF: 30 mg/ml,DMSO: 30 mg/ml,Ethanol: 30 mg/ml,PBS (pH 7.2): 10 mg/ml

form 

A crystalline solid

pka

3.46±0.20(Predicted)

Appearance

light yellow-brown solid

InChI

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

InChIKey

JIAKIQWNYAZUJD-UHFFFAOYSA-N

SMILES

N1C2=C(CCCC2=O)C=CC=1

CAS DataBase Reference

56826-69-8(CAS DataBase Reference)

Safety Information

HS Code 

2933499090

6,7-Dihydro-5H-quinolin-8-one Usage And Synthesis

Description

6,7-Dihydro-5H-quinolin-8-one is a synthetic intermediate. It has been used in the synthesis of tetrahydropyridoazepinones and thiosemicarbazones with anticancer activity.

Chemical Properties

light yellow crystalline

Uses

6,7-Dihydroquinolin-8(5H)-one is a synthetic intermediate useful for pharmaceutical synthesis.

Synthesis Reference(s)

The Journal of Organic Chemistry, 49, p. 2208, 1984 DOI: 10.1021/jo00186a027
Synthetic Communications, 33, p. 3497, 2003 DOI: 10.1081/SCC-120024729

Synthesis

Preparation of 6,7-dihydro-5H-quinolin-8-one: 8-hydroxy-5,6,7,8-tetrahydroquinoline (13.96 g, 93.6 mmol) was dissolved in anhydrous dichloromethane (400 mL) under stirring conditions. Subsequently, activated manganese dioxide (85% pure, 82.22 g, 804 mmol) was added to this solution. The resulting non-homogeneous mixture was stirred for 18 hours. Upon completion of the reaction, the black slurry was filtered through a diatomaceous earth filter cake and the cake was washed with dichloromethane (3 x 50 mL). The washes were combined and concentrated to afford 11.27 g (82% yield) of the target product, 6,7-dihydro-5H-quinolin-8-one, as a light yellow solid, which could be used in subsequent reactions without further purification. The structure of the product was characterized by 1H NMR (CDCl3) δ 2.17-2.25 (m, 2H), 2.82 (t, 2H, J = 7 Hz), 3.04 (t, 2H, J = 6 Hz), 7.37 (dd, 1H, J = 9,6 Hz), 7.66 (dd, 1H, J = 9,1 Hz), 8.71 (dd, 1H, J = 6,1 Hz); 13C NMR (CDCl3) δ 22.2, 28.6, 39.2, 126.6, 137.3, 140.5, 147.6, 148.6, 196.5 confirmed.ES-MS m/z 148 (M + H) further validated the product structure.

References

[1] Patent: US2003/220341, 2003, A1. Location in patent: Page/Page column 9
[2] Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1985, p. 213 - 220
[3] Patent: US2004/19058, 2004, A1

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