The first construction of the B,C,D-ring fragment of pinnatoxins via highly stereocontrolled acetallization
作者:Tetsuya Sugimoto、Jun Ishihara、Akio Murai
DOI:10.1016/s0040-4039(97)01725-5
日期:1997.10
The synthesis of the B,C,D-ring fragment of pinnatoxins is described. The highly stereocontrolled construction of the 6,5,6-tris-spiroacetal core was achieved on treatment of compound 3 with aqueous HF in CH3CN. The anomeric effect at C16 enhanced by neighboring carbonyl group led to form the tris-spiroacetal having the natural configuration.
描述了pinnatoxins的B,C,D环片段的合成。在CH 3 CN中用HF水溶液处理化合物3时,实现了6,5,6-三-螺缩醛缩醛核心的高度立体控制结构。在C 16处的异头作用被相邻的羰基增强,导致形成具有自然构型的三螺缩醛。