Studies toward a Marine Toxin Immunogen: Enantioselective Synthesis of the Spirocyclic Imine of (−)-Gymnodimine
作者:Ke Kong、Ziad Moussa、Daniel Romo
DOI:10.1021/ol051840r
日期:2005.11.1
copper-bis(oxazoline) complex was utilized to construct a highly functionalized spirolactam, a key intermediate in our projected total synthesis of the marine toxin, gymnodimine. Additional transformations, including a mild N-tosyl group deprotection, afforded a keto spirocyclic imine moiety, the proposed pharmacophore of gymnodimine. Thus, the prepared ketone is a potentially useful intermediate for conjugation
Total Synthesis of the Spirocyclic Imine Marine Toxin (−)-Gymnodimine and an Unnatural C4-Epimer
作者:Ke Kong、Ziad Moussa、Changsuk Lee、Daniel Romo
DOI:10.1021/ja207385y
日期:2011.12.14
The first total synthesis of the marine toxin (-)-gymnodimine (1) has been accomplished in a convergent manner. A highlydiastereo- and enantioselective exo-Diels-Alder reaction catalyzed by a bis-oxazoline Cu(II) catalyst enabled rapid assembly of the spirocyclic core of gymnodimine. The preparation of the tetrahydrofuran fragment utilized a chiral auxiliary based anti-aldol reaction. Two major fragments