Trifluoroacetic anhydride → (S)-2-fluoro-5-(1-(4-(5-isopropyl-1H-pyrazol-3-ylamino)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-2-yl)pyrrolidine-2-carboxamido)pyridine 1-oxide

Participants

Reaction Steps

To a solution of (S)—N-(6-fluoropyridin-3-yl)-1-(4-(5-isopropyl-1H-pyrazol-3-ylamino)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-2-yl)pyrrolidine-2-carboxamide (200 mg, 0.44 mmol) and urea-hydrogen peroxide (125 mg, 1.33 mmol) in DCM (10 mL) at 0° C. was added trifluoroacetic anhydride (280 mg, 1.33 mmol). The resulting mixture was allowed to stir at RT overnight. The reaction mixture was concentrated under reduced pressure to afford an oily residue that was diluted with saturated sodium bicarbonate solution (10 mL), and the product was extracted with EtOAc (2×25 mL). The combined organic layer was dried over anhydrous sodium sulfate. Removal of EtOAc under reduced pressure gave an oily residue that was purified by reverse phase HPLC to afford 10 mg of (S)-2-fluoro-5-(1-(4-(5-isopropyl-1H-pyrazol-3-ylamino)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-2-yl)pyrrolidine-2-carboxamido)pyridine 1-oxide. 1HNMR (400 MHz, CD3OD) δ (ppm): 1.20 (d, 6H), 2.02-2.18 (m, 4H), 2.21-2.36 (m, 2H), 2.75-2.93 (m, 5H), 3.60-3.70 (m, 1H), 3.77-3.84 (m, 1H), 4.77 (dd, 1H), 6.21 (s, 1H), 7.36-7.41 (m, 1H), 7.50 (s, 1H), 8.81-8.89 (m, 1H). The other enantiomer was obtained using chiral (R) starting material.

Provenance & Evidence