Scheme 1. Synthesis of enantiopure DPP–helicene derivatives P-H6DPP and P-H6(DPP)2. TMS: trimethylsilyl. Reaction conditions: (i) TBAF, CHCl3; (ii) Pd(PPh3)4, CuI, Et3N/toluene, 50 °C, DPPBr, 70% (H6DPP) and 75% (H6(DPP)2).
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