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a Reaction conditions: a) 1) boronic acid (1.4 equiv), K2CO3 (2.0 equiv), THF/H2O 4:1, 63 °C; 2) K2CO3 (3.0 equiv), DCM/MeOH 3:7, rt; b) methylenebis(phosphonic dichloride) (5 equiv), PO(OMe)3, 0 °C.
