Scheme 1.
Synthesis of the NDI moiety. (A) tert-Butyl 6-aminohexanoate, acetonitrile, 60°C, 4.5 h, N2; (B) N,N-dimethyl-1,3-propandiamine, 120°C, 5 min, MW; (C) dichloromethane, trifluoroacetic acid, triisopropylsilane, r.t., 6 h.
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