Reaktion #166169

Reaktionsgleichung

2-Chloroanisole

7,7,9,9-tetramethyl-8-(2′,4′,6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)-1,4-dioxa-8-phosphaspiro[4.5]decane

cesium carbonate

polytetrafluoroethylene

n-butanol

→

1-Butoxy-2-methoxybenzene

Ausbeute 62.0%

Lösungsmittel

toluene

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeIn a nitrogen-atmosphere glovebox, a 40-mL scintillation vial equipped with a magnetic stir bar
2. 2
   Sonstigecap septum
3. 3
   TemperaturAfter cooling
4. 4
   Sonstigethe reaction to room temperature
5. 5
   Filtrationfiltered through a pad of diatomaceous earth
6. 6
   WaschenAfter the vial was rinsed with ethyl acetate (2×2 mL)
7. 7
   Filtrationfiltered
8. 8
   Waschenthe filter cake was washed with ethyl acetate (2 mL)
9. 9
   SonstigeThe ethyl acetate was carefully removed on a rotary evaporator
10. 10
    Einengenconcentrate

Vorschrift

In a nitrogen-atmosphere glovebox, a 40-mL scintillation vial equipped with a magnetic stir bar was charged with palladium(II) acetate (3.2 mg, 0.014 mmol, 0.01 equivalents), 7,7,9,9-tetramethyl-8-(2′,4′,6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)-1,4-dioxa-8-phosphaspiro[4.5]decane (8.6 mg, 0.015 mmol, 0.011 equivalents) and cesium carbonate (686 mg, 2.10 mmol, 1.5 equivalents). The solids were then slurried in toluene (2.8 mL) and n-butanol (385 μL, 4.21 mmol, 3 equivalents). 2-Chloroanisole (178 μL, 1.40 mmol, 1 equivalent) was added by syringe, then the vial was sealed with a polytetrafluoroethylene (PTFE) screw cap septum and heated to 110° C. for 19 hours. After cooling the reaction to room temperature, the vial was brought outside the glovebox. The reaction mixture was diluted with ethyl acetate (2 mL) and filtered through a pad of diatomaceous earth. After the vial was rinsed with ethyl acetate (2×2 mL) and filtered, the filter cake was washed with ethyl acetate (2 mL). The ethyl acetate was carefully removed on a rotary evaporator. A weight percent (wt %) analysis was then performed on the crude concentrate to determine an assay yield of 62% (literature reference: Wolter M, et al. Org. Lett. 2002; 4: 973-976). 1H NMR (400 MHz, CDCl3) δ ppm 6.96-6.84 (m, 4H), 4.03 (t, J=6.8 Hz, 2H), 3.87 (s, 3H), 1.91-1.78 (m, 2H), 1.57-1.44 (m, 2H), 0.99 (t, J=7.4 Hz, 3H).

Quelle