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aConditions: (a) triphosgene, DMAP, CHCl3, −56 °C to rt; i-Pr2EtN, 54-α, CHCl3, −56 °C to rt, 2-(trimethylsilyl)ethanol, rt, 12 h, 92%; (b) Pd/C, NaHCO3, H2, THF, rt, 5 h, >99%; (c) TEOC-Cl, i-Pr2EtN, CH2Cl2, rt, 9 h, 96%; (d) PPTS, EtOH, rt, 4 h, 93%.
