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Synthesis of derivatives that require additional modification of Y′: a) diazomethane, Pd(OAc)2, Et2O, 0 °C; b) 2 n HCl, acetone, RT; c) acetic acid, 35 °C; d) Jones reagent, 0 °C; e) TBTU, methylamine, RT; f) TBAF, THF, RT; g) TPAP, NMO, CH2Cl2, molecular sieves, RT; h) 2‐methyl‐2‐butene, THF, tBuOH, NaOCl, 0 °C; i) (trimethylsilyl)diazomethane, THF, RT; j) NH3 in methanol, 85 °C; k) sulfuric acid, methanol, RT; l) oxone, 0 °C, m) amine, sodium triacetoxyborohydride, CH2Cl2, RT.
