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Structure and synthesis of 4-(imino)-1,4-dihydroquinoline derivatives. A. Structures of ferrocifen, hydroxyferrocifen and ferroquine; B. Synthesis of ferrocenyl 4-(imino)-1,4-dihydroquinolines 6-8. C. Synthesis of benzyl 4-(imino)-1,4-dihydroquinolines 9 and 10: (a) benzyl chloride, NaI, acetone, reflux, 12 h; (b) RNH2, EtOH, relux, 1 h. Synthesis of benzyl 4-(imino)-1,4-dihydroquinolines 11: (c) aniline, microwaves, 100 °C, 10 min; (d) benzyl chloride, microwaves, 80 °C, 40 min.
