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Reagents and conditions: (a) LiHMDS, THF, 7, −78 °C, 2 h, 60%; (b) H2, Pd/C, AcOEt, 15 h, 96%; (c) PPh3, DEAD, HSPT, 0 °C, THF, 24 h, quant.; (d) (NH4)6Mo7·4H2O/H2O2, 30%, EtOH, 0 °C, 20 h, 97%; (e) LiHMDS, THF/HMPA (9:1), butyrophenone, −78 °C to rt, 24 h, 32%; (f) EtSNa, DMF, ∆, 24 h, 75%.
