Reaktion #157811

Reaktionsgleichung

(5R)-5-[(Z)-2-bromo-2-(5-cyclopropyl-6-methoxypyridin-2-yl)ethenyl]pyrrolidin-2-one

tri(2-furyl)phosphine

4-chlorophenylboronic acid

cesium carbonate

→

(5R)-5-[(E)-2-(4-chlorophenyl)-2-(5-cyclopropyl-6-methoxypyridin-2-yl)ethenyl]pyrrolidin-2-one

Lösungsmittel

water

1,4-Dioxane

ethyl acetate

Water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Filtrationthe insoluble matter was filtered off through celite
2. 2
   Extraktionfollowed by extraction with ethyl acetate
3. 3
   TrocknenThe organic layer was dried over anhydrous magnesium sulfate
4. 4
   Filtrationfiltered
5. 5
   EinengenThe filtrate was concentrated under reduced pressure
6. 6
   SonstigeThe resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=50:50→0:100)

Vorschrift

1,4-Dioxane (4 mL) and water (0.4 mL) were added to a mixture of (5R)-5-[(Z)-2-bromo-2-(5-cyclopropyl-6-methoxypyridin-2-yl)ethenyl]pyrrolidin-2-one obtained in Reference Example 4-24 (170 mg), 4-chlorophenylboronic acid (160 mg), tris(dibenzylideneacetone) dipalladium (45 mg), tri(2-furyl)phosphine (69 mg) and cesium carbonate (492 mg), and the mixture was stirred at 90° C. for 2.5 hours. Water and ethyl acetate were added to the reaction solution and the insoluble matter was filtered off through celite, followed by extraction with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=50:50→0:100) to give (5R)-5-[(E)-2-(4-chlorophenyl)-2-(5-cyclopropyl-6-methoxypyridin-2-yl)ethenyl]pyrrolidin-2-one as a crude product (250 mg).

Quelle