Scheme 4.
Reagents and conditions (a) Bis(pinacolato)diboron, PdCl2(dppf), KOAc, DMF; (b) Raney Ni, NH2NH2, MeOH; (c) i) S-(2-naphthylmethyl)-2-pyridylthioimidate HBr, EtOH, CH3CN, NaOH; ii) EtOH/HCl.
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