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Synthetic route for preparation of 83. Reagents and conditions: (a) H2SO4, EtOH, reflux, 24 h; (b) MgCl2, (CH2O)n, TEA, THF, reflux, 14 h; (c) Tf2O, pyridine, DMAP, DCM, 0–15 °C, 1 h; (d) Pin2B2, KOAc, Pd(dppf)Cl2, 1,4-dioxane, N2, 85 °C, 15 h; (e) NaBH4, MeOH, THF, 0–15 °C, 1 h, then HCl, H2O; (f) NaOH,H2O, 40 °C, 3 h, then HCl for acidification.
