Cesium carbonate → 2-(Pyridin-4-yl)-2-aza-bicyclo[2.2.2]octan-3-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-azabicyclo[2.2.2]octan-3-one (0.6 g, 4.8 mmol), 4-bromopyridine hydrochloride (1.17 g, 5.76 mmol), Cs2CO3 (2.36 g, 7.20 mmol) and xantphos (0.22 g, 0.38 mmol) was purged with argon gas for 10 min. Tetrakis(triphenylphosphine)palladium (0) (0.22 g, 0.19 mmol) was added and degassed for another 10 min. The reaction mixture was heated at 125° C. for 3 h. The reaction mixture was cooled to room temperature and filtered. The filtrate was concentrated and dried under reduced pressure to afford the crude compound. Purification by column chromatography over neutral alumina using 0.5% MeOH in CHCl3 as eluent afforded 600 mg (61.9%) of 2-(pyridin-4-yl)-2-aza-bicyclo[2.2.2]octan-3-one as pale yellow solid.

Provenance & Evidence