“…Type II BZs were obtained by a two-steps procedure ( Scheme 2 ). BZ is 1 -5 were reacted with different aldehydes in the presence of glacial acetic acid to obtain the corresponding imines, which were then reduced with NaBH 4 to provide BZs 11 to 30 in 17 with a 57% yield [ 29 ]. Physicochemical, MS, NMR and IR spectral data for BZs type II are reported in the experimental Sections 4.1.2.8.1 -20 .…”