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Reagents and reaction conditions: a. ethyl chloroformate, K2CO3, toluene, 90–100°C; b. NaN(TMS)2, N-(5-chloro-2-pyridyl)triflimide, THF, −78°C; c. 3-pyridineboronic acid, Pd(PPh3)4, K3PO4, dioxane, 85°C; d. LAH, THF.