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Reagents and conditions: (a)441,442n-BuLi (2.2 equiv), TMEDA, hexane, −30, 60 °C or reflux, 30 min–3 h; (b) (1) PhPCl2, THF, −78 °C to rt, 3–4 h, (2) S powder, rt, 12.5–14 h; (c)443 THF, −78 °C to rt, then reflux, 12 h; (d)444 30% aq. H2O2, DCM/AcOH (1/2), 60 °C, 24 h.
