Diisopropylethylamine → (S)-tert-butyl 5-((S)-1-(4-bromo-3-fluorophenyl)-2-(4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-oxoethyl)-2,2-dimethylpyrrolidine-1-carboxylate

Participants

Reaction Steps

N-Ethyl-N-isopropylpropan-2-amine (0.045 mL, 0.26 mmol) was added to a solution of (S)-2-(4-bromo-3-fluorophenyl)-2-((S)-1-(tert-butoxycarbonyl)-5,5-dimethylpyrrolidin-2-yl)acetic acid (0.035 g, 0.081 mmol; prepared analogously to that described in Example B), (5R,7R)-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol dihydrochloride (0.025 g, 0.081 mmol; see Example 3, Step 12), and 2-(3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl)-1,1,3,3-tetramethylisouronium hexafluorophosphate(V) (0.031 g, 0.081 mmol) in DCM (5 mL). The reaction was stirred overnight at room temperature. The reaction was then quenched with H2O, washed with H2O (3×30 mL), dried with MgSO4, filtered and concentrated. The resulting residue was purified by flash chromatography to give (S)-tert-butyl 5-((S)-1-(4-bromo-3-fluorophenyl)-2-(4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-oxoethyl)-2,2-dimethylpyrrolidine-1-carboxylate (23% yield). LCMS (APCI+) 648.2 m/z [M+H]+; Retention time=4.28 minutes.

Provenance & Evidence