3,3,5-Trifluoro-1H-pyrrolo[2,3-b]pyridin-2(3H)-one (0.248 g, 1.318 mmol), tert-butyl(cis-3-hydroxycyclobutyl)carbamate (0.247 g, 1.318 mmol), and triphenylphosphine (0.519 g, 1.978 mmol) were mixed in THF (5 mL) under an argon atmosphere. The mixture was cooled to 0° C. before diisopropyl azodicarboxylate (0.389 mL, 1.978 mmol) was added dropwise via syringe. The reaction mixture was warmed to room temperature and stirred for 22 h. The reaction mixture was diluted with sat. NaHCO3 and extracted with EtOAc. The organic layer was separated, washed with saturated aqueous sodium chloride, dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting crude product was purified by silica gel column chromatography eluting with EtOAc in hexanes to yield the title compound (0.241 g, 0.674 mmol, 51.2% yield) as a white solid.
