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Synthetic route to type Ib linear repeating unit. Reagents and conditions: a) TMSOTf, CH2Cl2 dry, 0 °C, (β‐) 55 %; b) piperidine, CH2Cl2, 90 %; c) TMSOTf, CH2Cl2 dry, 0 °C, (β‐) 66 %; d) TfOH, NIS, CH2Cl2 dry, −40 °C, (β‐) 40 %; e) HF/pyridine; 3 m NaOH, THF, reflux; Ac2O/MeOH; H2/Pd‐C, 40 %.
