Scheme 1.
Synthesis of O-linked compounds 3–6. Conditions: (a) BnONHAc, NaH, NaI, THF, 70°C, 75 %; (b) H2, Pd/C, MeOH, 76 %; (c) R(CH2)nBr, NaH, THF, 70°C, 27–81 %; (d) i: TMSBr, CH2Cl2, ii: H2O, iii: NaOHaq, 61 %-quant.
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