5-Amino-2-fluoropyridine → (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

Participants

Reaction Steps

To a solution of 6-fluoropyridin-3-amine (6.05 g, 13 mmol) in dry THF (100 mL) was added 2M solution of isopropylmagnesium chloride in THF (27 mL, 54 mmol) dropwise under nitrogen at 0° C. The resultant mixture was stirred at 0° C. for 20 min. To this solution was added a solution of methyl 1-(4-(5-isopropyl-1H-pyrazol-3-ylamino)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-2-yl)pyrrolidine-2-carboxylate (5 g, 13 mmol) in THF (20 mL) dropwise at 0° C. and the reaction mixture was allowed to stir at RT for 2 h. The reaction was quenched with saturated ammonium chloride solution (50 mL). The product was extracted with EtOAc (2×40 mL) and the organic layer was dried over anhydrous sodium sulfate. Removal of EtOAc under reduced pressure gave solid residue which was purified by column chromatography on silica gel using 1-2% MeOH-DCM system as eluent followed by chiral purification to afford (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 (2.2 g). 1H NMR (CDCl3, freebase) δ (ppm): 1.22 (d, 6H), 1.90-2.21 (m, 6H), 2.60-2.70 (m, 1H), 2.72 (t, 2H), 2.88 (t, 2H), 2.81-2.96 (m, 1H), 3.60-3.80 (m, 2H), 4.77 (d, 2H), 6.40 (s, 1H), 6.74 (s, 1H), 6.82 (d, 1H), 7.90 (s, 1H), 8.13 (s, 1H). The other enantiomer was prepared using the (R) chiral starting material.

Provenance & Evidence