Scheme 1.
(a) HOTs, benzene, reflux 12h; (b) Tf2O, CH2Cl2, pyridine, 0 °C to 25 °C, 3 h (c) Pinacolborane, Pd(dppf)Cl2, CH3CN, Et3N, reflux 18 h (d) CuBr2, MeOH, H2O (3:1), reflux 10 h.
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