Cesium carbonate → HCID 178522380, compound

Participants

Reaction Conditions

Reaction Steps

In a sealed tube three cycles of vacuum and argon were applied to a mixture of the N-[6-chloro-5-(3-fluoro-1-oxidopyridin-4-yl)pyrazin-2-yl]cyclopropanecarboxamide (2.23 g, 7.22 mmol), pyridin-3-ylboronic acid (1.15 g, 9.39 mmol) and Cs2CO3 (7.06 g, 21.66 mmol). A solution of 1,4-dioxane:H2O (64 mL, 9:1) was added and argon was bubbled for 5 min, after which, PdCl2dppfCH2Cl2 (0.59 g, 0.72 mmol) was added and argon was again bubbled other 5 min. The reaction mixture was heated at 90° C. for 1 h. Upon the reaction completion the 1,4-dioxane was concentrated in vaccuo, and the obtained residue was adsorbed onto silica gel with 10% MeOH/THF (150 mL) and purified by column chromatography on silica gel eluting with a MeOH/EtOAc gradient (0→20%). The green solid obtained was precipitated with 1% MeOH/CH2Cl2 (5 mL), and washed with 1% MeOH/CH2Cl2 (3×3 mL), CH2Cl2 (3×5 mL), 1% MeOH/Et2O (3×5 mL) and Et2O (4×5 mL) to yield the title compound as a white powder (1.41 g, 56%).

Provenance & Evidence