Colombian corals of the species Pseudopterogorgia elisabethae produce the title compound, colombiasin A (1). This structurally novel, biologically active tetracyclic compound has now been synthesized for the first time in racemic form. Preliminary studies toward the asymmetric total synthesis of both enantiomers indicate that the determination of the absolute stereochemistry can be expected soon.
Total Synthesis of Colombiasin A and Determination of Its Absolute Configuration
作者:K. C. Nicolaou、Georgios Vassilikogiannakis、Wolfgang Mägerlein、Remo Kranich
The total synthesis of the recently reported marine natural product colombiasin A (1) and determination of its absoluteconfiguration are reported. Two Diels-Alder cycloadditions and a palladium-catalyzed rearrangement are employed as key reactions to construct the tetracyclic framework of the target molecule. The enantioselective synthesis of colombiasin A utilizes Mikami's [(S)-BINOL-TiCl2] catalyst