A series of marine alkaloid 8, 9-dihydrocoscinamide B, its analogues and indolylglyoxylamide derivatives have been synthesized and screened for their in vitro antileishmanial activity profile in promastigote and amastigote models. Compounds 7 and 10 have shown 99–100% inhibition against promastigotes and 97–98% inhibition against amastigotes at a concentration of 10μg/ml.