Search

Fifteen novel β-lactams bearing N-ethyl tert-butyl carbamate group 5a-o and fifteen N-(2- aminoethyl) β-lactams 6a-o were synthesized by [2+2] ketene-imine cycloaddition reaction (Staudinger). The cycloaddition reaction was found to be totally diastereoselective leading exclusively to theformation of cis -β-lactam derivatives. These newly synthesized β-lactams were evaluated for their antimalarial activity against p. falciparum K14 resistant strain and showed good to excellent EC50 values. Of the thirty β-lactams tested, 5 h, 6a and 6c showed IC50 < 20 µM while 5b , 5c , 5e , 5f , 5g , 5i , 5j , 6d , 6g and 6h exhibited IC50 <50 . Compounds 5c, 5h, and 5q-t were examined for their anticancer properties against K562 Leukemia cell line and 5s showed the best activity. Compounds 3a-j , 5a-o , 6a-o , were tested against S. aureus , E. coli , C. albicans and showed no activity below 125 µg/mL.