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Synthesis of compounds 153–157. Reagents and conditions: (a) NaIO4, HOAc, rt, 17 h; (b) CH3Cl, rt, 0.5 h; (c) 10% aq. NaOAc/EtOH, reflux, 15 h; (d) CrO3, pyridine, CH2Cl2; (e) NH4Cl, pyridine, EtOH, reflux, 54 h; (f) RSO2Cl, NaH, THF, rt, overnight.
