Benzene → (S)-tert-butyl 5-((S)-(2-fluoro-4-(trifluoromethyl)phenyl)(2-(tetrahydro-2H-pyran-4-ylamino)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine-7-carboxamido)methyl)-2,2-dimethylpyrrolidine-1-carboxylate

Participants

Reaction Steps

To a solution of 322 (0.341 g, 0.813 mmol) and benzene (8 mL) cooled 0° C. was added TEA (0.154 mL, 1.11 mmol) and diphenylphosphoryl azide (0.239 mL, 1.11 mmol) and the reaction stirred at RT for 1 h then refluxed for 3 h. The reaction was then cooled to RT and a solution of 28 (0.200 g, 0.739 mmol), TEA (0.154 mL, 1.11 mmol) and DMF (3 mL) was added, and stirred at RT for 18 h. The reaction was poured into water and extracted with DCM. The combined organic extracts were dried (MgSO4), filtered, and concentrated in vacuo. The crude product was purified by SiO2 chromatography eluting with DCM/MeOH (500:10) to afford 0.360 g (74.9%) of (S)-tert-butyl 5-((S)-(2-fluoro-4-(trifluoromethyl)phenyl)(2-(tetrahydro-2H-pyran-4-ylamino)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine-7-carboxamido)methyl)-2,2-dimethylpyrrolidine-1-carboxylate (324).

Provenance & Evidence