Synthesis and biological evaluation of some new β-lactam-triazole hybrids

A series of novel b-lactams was synthesized from different imines and a special ketene derived from N-endo-5-norbornene-2,3-dicarboxyloylglycine 1 via the [2 + 2] ketene imine cycloaddition. Then, beta-lactams 3a-h were treated with 1-azido-4-nitrobenzene 4 to afford beta-lactam-triazole hybrids 5a-h. Of the twenty-three beta-lactams tested against chloroquine-resistant P. falciparum K14 strain, 3a and 3d showed IC50 < 20 mu M, while 3j, 3m, 5a-5f exhibited IC50 < 50. These newly synthesized beta-lactams were also tested against S. aureus, E. coli, P. aeruginosa, C. albicans and C. glabrata and showed no activity below 125 mu g/mL.