Scheme 1. Synthesis of the building blocks and DNA. Reagents and conditions: (i) Pd(PPh3)4, CuI, TEA, DMF, 91%; (ii) CEP-Cl, DIPEA, DCM, quant.; (iii) EDC, HOBt, DMAP, DCM, 68%; (iv) CEP-Cl, DIPEA, DCM, quant. SPS: Solid Phase Synthesis of DNA.
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