4-Aminopyridine → 1-Cyclopropyl-3-[2-(pyridin-4-ylamino)pyrimidin-4-yl]propan-2-one

Participants

Reaction Steps

To a solution of 4-aminopyridine (328 mg, 3.49 mmol) in THF (2.344 mL) cooled to −78° C. was added LHMDS (583 mg, 3.49 mmol). The reaction was warmed to rt and stirred for 15 minutes. The reaction was again cooled to −78° C. and 1-cyclopropyl-3-[2-(methylsulfinyl)pyrimidin-4-yl]propan-2-one (7) (277 mg, 1.162 mmol) was added as a solution in THF (2 mL). The reaction was warmed to rt and stirred for 1 hour. The reaction was quenched by slow addition of saturated ammonium chloride and the volatiles evaporated. The residue was then partitioned between water and DCM. The organic layer was washed with brine, dried with sodium sulfate, and concentrated in vacuo. The crude residue was purified by Biotage™ silica gel chromatography [2-10% MeOH in DCM with 1% triethylamine] to afford the desired product as a yellow oil (269 mg, 86%). MS (ES+): m/z=269.2 (100) [MH+2]. HPLC: tR=0.69 minute over 3 minutes. Purity: >95% [HPLC (LC/MS) at 220 nm].

Provenance & Evidence