2001 年 59 巻 10 号 p. 938-947
Hapalosin isolated from Hapalosisiphon welwitschii W. & G. S. West, is a cyclic depsipeptide carrying the reversing activity against multidrug-resistance (MDR) of cancer cells acquired during chemotherapy. The 12-membered-ring structure that consists of 2-hydroxy-3-methylbutanoic acid, 3-hydroxy-2-methyldecanoic acid, and 3-hydroxy-4-(methylamino)-5-phenylpentanoic acid, adopts a 3:1 mixture of conformers related to the amide residue. From biological and stereochemical points of view, many research groups have challenged this intriguing target. This review discloses chemical investigations of hapalosin and related derivatives, as well as their biological activities.