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Reagents and conditions: (a) CbzCl, DMAP, 23 °C, 0.5 h, DMF; 2, 2–12 h; MsOH, then 3, 60–120 °C; (b) Ph3PAuNTf2, 50 °C, toluene, 1–12 h; (c) AcOH, NaBH3CN, MeOH, 0 °C, 0.5 h; (d) BF3·Et2O, Me2S, DCM, 23 °C, 1.5 h; (e) R2X, Et3N, DCM, 0 °C, 0.5–2 h.
