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Synthesis of cyclic monomers 1 and 2 using an acid chloride coupling. Conditions: (i) NaNO2, TFA, H2O, 25 °C, 6 h; (ii) NaNO2, aq. KHSO4, 0–25 °C, 3 h; (iii) 75 °C, 6 h; (iv) DIEA, Et2O, 0–40 °C, 12 h; (v) KI, acetone, 65 °C, 12 h; (vi) DIEA, acetone, 75 °C, 10 h.
