Scheme 2. Metal-Catalyzed 1,2-Boryl Migration in the Synthesis of 3-Borylated Furans.
MIDA = N-methyliminodiacetic acid; PIDA = pinene-derived iminodiacetic acid; BF3OEt2 (1.0 equiv), DCM, −30 °C.; [CuOTf]2·PhH (5 mol %), DCE, 30 °C.
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