Biomimetically Inspired Total Synthesis and Structure Activity Relationships of 1-<i>O</i>-Methyllateriflorone. 6π Electrocyclizations in Organic Synthesis
作者:K. C. Nicolaou、Pradip K. Sasmal、Hao Xu
DOI:10.1021/ja040037+
日期:2004.5.1
The total synthesis of 1-O-methyllateriflorone (2) is described. The construction of the cage-like domain of the molecule involved a biomimetic Claisen/Diels-Alder cascade, whereas the novel spiroxalactone framework was generated by an intramolecular Michael reaction within precursor 16a involving the carboxylate residue as the nucleophile. This finding might bear on the biosynthetic pathway by which
描述了 1-O-methyllateriflorone (2) 的全合成。分子的笼状结构域的构建涉及仿生 Claisen/Diels-Alder 级联,而新型螺内酯框架是通过前体 16a 内的分子内迈克尔反应生成的,涉及羧酸残基作为亲核试剂。这一发现可能与自然界形成晚花酮的生物合成途径有关。本文还描述了一个有趣的级联序列,涉及容易的 6 pi 电环化,这导致复杂的苯并吡喃系统。还包括对在此类化合物中建立第一个 SAR 的侧花酮类似物和相关系统的小型文库的生物学评估。抗肿瘤细胞活性最强的化合物是 2、16b、56、58 和 59。