Second-generation total synthesis of haterumalide NA, a potent cytotoxic marine macrolide, was achieved by using B-alkyl Suzuki - Miyaura coupling and Nozaki - Hiyama - Kishi coupling as key steps (1.2% in 33 steps). Compared to our first-generation approach, the second-generation synthesis is much improved in the yield of key intermediate.
Total Synthesis and Cytotoxicity of Haterumalides NA and B and Their Artificial Analogues
first-generation approach for ent-haterumalide NA methyl ester, this second-generation synthesis yielded much more of the key intermediate. This synthesis established the relative stereochemistry of haterumalide B. Furthermore, the structure−cytotoxicity relationships of haterumalides were investigated. The combination of macrolide and sidechain parts proved to be important to the cytotoxicity.