Reaktion #494789

Reaktionsgleichung

6-tert-butyl-8-fluoro-2H-phthalazin-1-one

6-tert-Butyl-8-fluorophthalazin-1(2H)-one

2-chloro-6-fluorobenzaldehyde

cesium carbonate

ethoxytrimethylsilane

→

101i

Ausbeute 52.0%

2-(6-tert-Butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-6-chlorobenzaldehyde

Ausbeute 52.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe flask was evacuated
2. 2
   Temperaturto cool down to ambient temperature
3. 3
   Sonstigethe reaction was quenched by addition of 2 mL of H2O drop-wise
4. 4
   Sonstigeto precipitate from the DMF and water mixture
5. 5
   FiltrationThe solid was collected by filtration
6. 6
   Temperaturafter cooling down to 5° C.
7. 7
   Waschenwashed with DMF/water (2/1, 2 mL, pre-cooled to 6° C.) and H2O (2 mL)
8. 8
   SonstigeThe filter cake was dried under vacuum oven at 65° C. for overnight

Vorschrift

To a 10 mL round bottom flask were added 6-tert-butyl-8-fluoro-2H-phthalazin-1-one 101h (640 mg, 2.9 mmol), 2-chloro-6-fluorobenzaldehyde (506 mg, 3.2 mmol), and cesium carbonate (488 mg, 1.5 mmol). The flask was evacuated and backfilled with nitrogen three times then ethoxytrimethylsilane (684 mg, 5.8 mmol) and DMF (5 mL) were added to the reaction flask. The resulting mixture was heated to 60° C. After 4 h of stirring, the solution was allowed to cool down to ambient temperature and the reaction was quenched by addition of 2 mL of H2O drop-wise. The desired product started to precipitate from the DMF and water mixture. The solid was collected by filtration after cooling down to 5° C., and washed with DMF/water (2/1, 2 mL, pre-cooled to 6° C.) and H2O (2 mL). The filter cake was dried under vacuum oven at 65° C. for overnight to afford 519 mg (52%) of 101i as a yellow solid. MS: [M+H]+: 359

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