Scheme 2.
Synthesis of N3‐Cy5‐COOH. a) N‐(3‐Bromopropyl)phthalimide in p‐dichlorobenzene; b) MeNH2 in EtOH/H2O; c) Imidazole‐1‐sulfonyl azide⋅HCl, NMM, CuSO4 (cat.), MeCN/H2O.
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