Phosphorus oxychloride → HCID 59362936, Verbindung
Reaktionsgleichung
[CH:1]1([C:6]2[NH:7][C:8](=O)[C:9]3[CH2:14][CH2:13][CH2:12][C:10]=3[N:11]=2)[CH2:5][CH2:4][CH2:3][CH2:2]1.O=P(Cl)(Cl)[Cl:18]>>[Cl:18][C:8]1[C:9]2[CH2:14][CH2:13][CH2:12][C:10]=2[N:11]=[C:6]([CH:1]2[CH2:5][CH2:4][CH2:3][CH2:2]2)[N:7]=1Komponenten
3
Reaktionsbedingungen
- Temperatur
- 100 °C
Versuchsvorschrift
A 250-mL round bottom flask was charged with crude 2-cyclopentyl-6,7-dihydro-3H-cyclopenta[d]pyrimidin-4(5H)-one (4.05 g) and POCl3 (22 mL, 23.8 mmol). The resulting mixture was stirred at 100° C. for 5 h. After cooling to room temperature, the mixture was concentrated under reduced pressure. The residue was poured into water (250 mL) and dichloromethane (50 mL) then treated with aqueous sodium hydroxide until the pH˜8. The aqueous layer was extracted with dichloromethane (2×50 mL). The combined organic extract was washed the saturated sodium chloride (2×20 mL), dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica on chromatography using dichloromethane/methanol (10:0 to 9:1) as eluent to afford the title compound (0.095 g, 3% over 2 steps) as a brown oil. MW=222.71. 1H NMR (CDCl3, 300 MHz) δ 3.31 (quin, J=2.4 Hz, 1H), 3.07 (t, J=7.8 Hz, 2H), 2.97 (t, J=7.5 Hz, 2H), 2.22-2.00 (m, 4H), 1.98-1.76 (m, 4H), 1.75-1.60 (m, 2H).