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Synthesis of ATP-based D–A–D-type molecules. Reagents and conditions: (a) N-bromosuccinimide, conc. H2SO4, RT, 2 h (85%); (b) ethylenediamine, EtOH, 80 °C, 1 h, then AcOH, Air, 80 °C, 2 h (56% for 2, 56% for 4); (c) Ar2NH, Pd(OAc)2, P(t-Bu)3, K2CO3, toluene, 24 h, 110 °C; (d) Br2, benzoylperoxide, nitrobenzene, 130 °C, 3 h (85%); (e) Ar2NH (donor units), Pd2(dba)3·CHCl3, N-phenyl-2-(di-t-butylphosphino)indole (cataCXium® PIntB), t-BuONa, toluene, 24 h, 110 °C.
