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Reagents and conditions: a) TBSOTf, 2,6-lutidine, CH2Cl2, −78 °C, 97%; b) DIBAL-H, CH2Cl2, −78 °C; c) LDA, TMSCHN2, THF, −78 °C, 57%; d) (COCl)2, DMSO, Et3N, CH2Cl2, −78 °C, 85%; e) I2, PPh3, imidazole, CH2Cl2; f) PPh3, MeCN, Δ, 90%; g) NaHMDS, HMPA, THF, 15, −78 °C, 83%.
