Cesium carbonate → Methyl 2-(pyridin-3-ylamino)pyrimidine-5-carboxylate

Participants

Reaction Steps

Two 20 mL microwave vials were each charged with methyl 2-aminopyrimidine-5-carboxylate (460.0 mg, 3.0 mmol), 3-bromopyridine (711.0 mg, 4.5 mmol), Pd2(dba)3 (110.0 mg, 0.12 mmol), XantPhos (208.3 mg, 0.36 mmol), Cs2CO3 (1.95 g, 6.0 mmol) and anhydrous dioxane (20 mL). The mixture was purged with argon gas for 15 min, then sealed and irradiated in a microwave (Initiator, Biotage) at 180° C. for 60 min. After cooling to room temperature, the cap was removed and the reaction mixtures were combined and diluted with ca. 100 mL of EtOAc. The resulting solution was concentrated in vacuo with ca. 15 g of silica gel. The loaded silica gel was taken to the ISCO system for further purification (80 g column, solid method, 0% to 20% MeOH gradient in DCM, 40 min method). Fractions, containing the product, were combined and concentrated in vacuo to give a reddish solid. The solid was washed with EtOAc (1×10 mL), Et2O (3×40 mL) and dried in vacuo to give the title compound as a fine beige powder (0.98 g, 47% yield).

Provenance & Evidence