3,4-Dihydro-2H-pyrido[3,2-b][1,4]oxazine Chemical Properties

Melting point:

85 °C

Boiling point:

285.7±29.0 °C(Predicted)

Density 

1.168

storage temp. 

2-8°C(protect from light)

pka

9.82±0.20(Predicted)

Appearance

White to off-white Solid

Safety Information

HazardClass 

IRRITANT

HS Code 

2933399990

3,4-Dihydro-2H-pyrido[3,2-b][1,4]oxazine Usage And Synthesis

Definition

ChEBI: 3,4-Dihydro-2H-pyrido[3,2-b][1,4]oxazine is a secondary amine.

Synthesis

(a) Synthesis of 3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine: To a solution of 2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one (5.00 g, 33.3 mmol) in tetrahydrofuran (THF, 40 mL) was slowly added lithium aluminium hydroxide (66.6 mL, 1.0 M THF solution. 66.6 mmol). After addition, the reaction mixture was heated to reflux. After 18 hours of reaction, the reaction was cooled to 0 °C and water (4 mL), sodium hydroxide solution (4 mL, 15%) and water (10 mL) were added sequentially to quench the reaction. Subsequently, the reaction mixture was filtered through diatomaceous earth and the filtrate was concentrated to afford the target product 3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine (3.87 g, 85% yield) as a blue-gray powder. The product was characterized by 1H NMR (500 MHz, DMSO-d6): δ 7.53 (dd, J=4.5,1.0 Hz, 1H), 6.90-6.89 (m, 1H), 6.61 (br s, 1H), 6.44 (dd, J=8.0,3.0 Hz, 1H), 4.08 (t, J=4.5 Hz, 2H), 3.39- 3.36 (m, 2H); mass spectrum (ESI) m/e 131 (M+H)+.

References

[1] Patent: WO2007/53131, 2007, A2. Location in patent: Page/Page column 133
[2] Patent: EP1226138, 2004, B1
[3] Acta Chemica Scandinavica (1947-1973), 1969, vol. 23, p. 2322 - 2324
[4] Patent: US2008/305169, 2008, A1
[5] Patent: US2007/10670, 2007, A1. Location in patent: Page/Page column 92

3,4-Dihydro-2H-pyrido[3,2-b][1,4]oxazine(20348-23-6)Related Product Information

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