Potassium Carbonate → (S)-tert-Butyl 2-((S)-1-amino-3-(4-(3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)phenyl)-1-oxopropan-2-ylcarbamoyl)piperidine-1-carboxylate

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A mixture of (S)-tert-butyl 2-((S)-1-amino-1-oxo-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propan-2-ylcarbamoyl)piperidine-1-carboxylate (113 mg), 5-bromo-3-methylbenzo[d]oxazol-2(3H)-one (51.4 mg), [1,1′-bis[bis(1,1-dimethylethyl)phosphino-κP]ferrocene]dichloro palladium (7.34 mg) and potassium carbonate (93 mg) in acetonitrile (0.7 mL) and water (0.35 mL) was stirred at 75° C. for 2 h. The solvent was removed in vacuo and the residue was purified by flash silica chromatography eluting with 1:1 isohexane/acetone to give the subtitle compound (112 mg).

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