Pyrrolo[2,1-c][1,4]benzodiazepines (PBDs) are a group of potent, naturally occurring antitumor antibiotics produced by Streptomyces species. Recently, we reported a series of novel PBD linked with indole carboxylates. Preliminary in vivo tests show that these hybrid agents have potent antitumor activity. In this thesis, we present the total synthesis of PBD hybrids linked with enedyine , and tail-to-tail linked PBD dimers. These derivatives are expected to increase the anticancer abilities .