Cesium carbonate → 4-methyl-N-[3-methyl-5-(1,3-thiazol-5-yl)phenyl]pyrimidin-2-amine

Participants

Reaction Conditions

Reaction Steps

A microwave vial was charged with Intermediate 18 (218 mg, 0.670 mmol), 5-bromo-1,3-thiazole (59.9 μL, 0.670 mmol), Pd2(dba)3 (30.7 mg, 0.034 mmol), X-Phos (32.0 mg, 0.067 mmol) and cesium carbonate (437 mg, 1.341 mmol). The system was purged and flushed with Ar(g) four times before adding dioxane (918 μL) and water (92 μL). Again, the system was purged and flushed five times before sealing the vial and heating at 100° C. LCMS showed ˜60% desired product, ˜35% de-borolated product and remaining unreacted starting material. The reaction mixture was diluted with ethyl acetate, filtered through a celite plug and concentrated. The resultant residue was purified by column chromatography on silica gel (Biotage, 0-20% ethyl acetate in hexanes) to afford 4-methyl-N-[3-methyl-5-(1,3-thiazol-5-yl)phenyl]pyrimidin-2-amine (105 mg, 0.372 mmol, 55.5%). MS ESI: [M+H]+ m/z 283.0. 1H NMR (500 MHz, DMSO-D6) δ 9.60 (s, 1H), 9.04 (s, 1H), 8.35 (d, J=6.6, 1H), 8.18 (s, 1H), 8.04 (s, 1H), 7.54 (s, 1H), 7.10 (s, 1H), 6.75 (d, J=6.3, 1H), 2.37 (s, 3H), 2.30 (s, 3H).

Provenance & Evidence