1,1'-Carbonyldiimidazole → (S)-5-(4-(5-(4-isopropyl-2-oxooxazolidin-3-yl)pyrazolo[1,5-a]pyrimidin-3-yl)phenyl)-1,3,4-oxadiazol-2(3H)-one

Participants

Reaction Steps

To a solution of (S)-4-(5-(4-isopropyl-2-oxooxazolidin-3-yl)pyrazolo[1,5-a]pyrimidin-3-yl)benzohydrazide (Example 9, Step 2; 91 mg, 0.239 mmol) in DMF (2 mL) was added di(1H-imidazol-1-yl)methanone (40.7 mg, 0.251 mmol). The reaction mixture was allowed to stir for 1 hour at ambient temperature, then dissolved in EtOAc, washed with water and brine, and concentrated. The resulting solid was suspended in dichloromethane, filtered, washed with dichloromethane, then concentrated to give crude product. The residue was purified by silica gel chromatography (0-5% MeOH in dichloromethane) to afford 42.8 mg (44%) of (S)-5-(4-(5-(4-isopropyl-2-oxooxazolidin-3-yl)pyrazolo[1,5-a]pyrimidin-3-yl)phenyl)-1,3,4-oxadiazol-2(3H)-one. LCMS (APCI+) m/z 407.5 [M+H]+.

Provenance & Evidence