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. Author manuscript; available in PMC: 2008 Sep 15.
Published in final edited form as: Biomacromolecules. 2006 Jun;7(6):1735–1742. doi: 10.1021/bm060024j

Scheme 2.

Scheme 2

Synthesis of cyclic monomers 2 and 3. Conditions: (i) NaNO2, aq. KHSO4, 0–25 °C, 3 h; (ii) NaNO2, 1:1 AcOH/H2O (v/v), 0–25 °C, 3 h; (iii) DCC, HOBt, CH2Cl2, 25 °C, 12 h; (iv) KI, acetone, 65 °C, 12 h; (v) DIEA, acetone, 75 °C, 10 h.