A solution of 69.0 mg (0.244 mmol) of 4-(4-amino-3-bromo-phenyl)-piperidine-2,6-dione (as prepared in the previous step) in toluene (10 mL) and dioxane (10 mL) was treated with 30.7 mg (0.244 mmol) of cyclohex-1-enylboronic acid, 104 mg (0.487 mmol) of K3PO4, and 34.2 mg (0.0975 mmol) of 2-(dicyclohexylphosphino)biphenyl. The mixture was degassed via sonication, placed under Ar, treated with 5.50 mg (0.0244 mmol) of Pd(OAc)2, and heated to 90° C. for 5 h. The mixture was diluted with EtOAc (30 mL) and washed with water (2×20 mL). The organic layer was dried (MgSO4) and concentrated in vacuo to afford 73.5 mg (106%, some solvent trapped) of the title compound as a tan solid: Mass spectrum (ESI, m/z): Calcd. for C17H20N2O2, 285.2 (M+H). found 285.2.
