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Reagents and conditions: (a)636,637 (2-R1-C6H4)2CHLi (2.0 equiv), THF, −98 °C to rt, 2 h; (b)636,637 Pd(OAc)2, PCy3·HBF4, K2CO3 (5.0 equiv), toluene, reflux, overnight; (c)636 H2SO4/CF3CO2H, 0 °C to rt, 45 min; (d)636 BAHA, CDCl3, rt; (e)636 cobaltocene, [D8]THF, rt.
