3-{1-[6-(2,4-Difluorophenyl)pyridin-2-yl]-2-oxobut-3-yn-1-yl}-4-fluorobenzonitrile → 3-[6-(2,4-difluorophenyl)-2-oxo-2H-quinolizin-1-yl]-4-fluorobenzonitrile

Participants

Reaction Steps

To a solution of 3-{1-[6-(2,4-difluorophenyl)pyridin-2-yl]-2-oxobut-3-yn-1-yl}-4-fluorobenzonitrile (From Step E above, 24 g, 63.8 mmol) in NMP was heated to 90° C. for ½ hour. LCMS analysis revealed the reaction was complete and the reaction was poured into ice water (4 L). After stirring for 12 h, the solid precipitate was collected by filtration. The solid was purified via silica gel chromatography (CH2Cl2/EtOAc/MeOH). The aqueous filtrate was extracted with EtOAc. The organic layer was washed with H2O (4×), brine (2×), dried over MgSO4, and condensed in vacuo. The crude residue was purified using silica gel chromatography (CH2Cl2/EtOAc/MeOH). A combined 7.8 g of the title compound was collected.

Provenance & Evidence