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Synthesis of alkenyl triflate 39. Reagents and conditions: a) DIBAL-H, toluene, −78 °C; b) TMSCN, BF3•OEt2, −12 °C to −5 °C, 51% from 35, 78:22 dr; c) Ni(acac)2, MeMgBr, toluene, −15 °C to −8 °C, 50%, 93:7 dr; d) (SO2CF3)2NC5H3NCl, LHMDS, THF, −78 °C to 0 °C.
