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Reagents and conditions: (a)677 (1) Ti(Oi-Pr)4−i-PrMgCl, (2) PhPCl2, (3) H2O2 or S8, Et2O; (b) conc. H2SO4, CF3COOH; (c) Zn(OAc)2·2H2O, DCM/MeOH; (d) Lawesson’s reagent, toluene; (e) P(NMe2)3, toluene; (f) air; (g)678 aniline, PdCl2, Et3N, toluene/DMSO.
