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(a) KOH, DMSO, 20 h, 84%. (b) PPA, benzene, 89%. (c) n-BuLi, THF, −78 °C. (d) B(iPrO)3. (e) 2 N HCl or NH4Cl (66% yield after steps c−e). (f) PdCl2(Ph3P)2 (5 mol %) Et3N, EtOH, 100 °C, microwave, 65%. (g) AcOH, NaCNBH3, DCM/MeOH, 56%.
