has been completed. anti-Glycolate aldol, glycolate alkylation, and ring-closing metathesis reactions were employed as key bond-forming events. A convergent assembly strategy was employed that relied on a Horner-Wadsworth-Emmons union of two complex fragments. Subsequent cyclization and dehydration led to efficient generation of an intermediate endocyclic enol ether, which was advanced to a tetracyclic
短毒素A BCDE片段的立体选择性合成已经完成。抗
乙醇酸羟醛,
乙醇酸烷基化和闭环复分解反应被用作关键的键形成事件。采用了基于两个复杂片段的Horner-Wadsworth-Emmons联合的收敛装配策略。随后的环化和脱
水导致中间体内环烯醇醚的有效生成,该中间体被发展为四环片段。[反应:看文字]