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Reagents and conditions: (a) BzCl, DMAP, pyridine, 88 °C, 3 h; (b) BCl3, CH2Cl2, −78 °C, 40 min; (c) DAST, CH2Cl2, −10 °C, 30 min; (d) 1 M NaOMe, CH2Cl2, MeOH, rt, 4 h; (e) BzOH, PPh3, DEAD, THF, 60 °C, 5 h; (f) 1 M NaOMe, MeOH, CH2Cl2, rt, 7 h.
