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Reagents and conditions: (a) triisopropyl borate, n-BuLi, toluene, THF – 78 °C, 81%; (b) Pd(PPh3)4, 3-bromo-2-methylaniline, Na2CO3, DME, EtOH, H2O, 90 °C, 92%; (c) isoamyl nitrite, KOAc, AcOH, toluene, 73%; (d) aryl/heteroaryl halide, (1R,2R)-cyclohexane-1,2-diamine, CuI, K3PO4, dioxane, 100 °C, 25–74%.
