Natural Product-Guided Synthesis of a Spiroacetal Collection Reveals Modulators of Tubulin Cytoskeleton Integrity
作者:Okram Barun、Kamal Kumar、Stefan Sommer、Anette Langerak、Thomas U. Mayer、Oliver Müller、Herbert Waldmann
DOI:10.1002/ejoc.200500605
日期:2005.11
underlying structural skeleton of numerous biologically active natural products. Since simplified but characteristic spiroketals derived from the parent natural products retain biological activity, the spiro[5.5]ketal unit can be regarded as a biologically prevalidated framework for the development of natural product-derived compound collections. We report an enantioselective synthesis of spiro[5.5]ketals
螺[5.5]缩酮部分构成了许多具有生物活性的天然产物的基本结构骨架。由于源自母体天然产物的简化但特征性的螺缩酮保留了生物活性,螺[5.5]缩酮单元可被视为开发天然产物衍生化合物集合的生物学预验证框架。我们报告了螺[5.5] 缩酮在固体载体上的对映选择性合成。反应序列采用不对称硼烯醇醇醛醇反应,烯醇与聚合物结合或在溶液中作为关键的对映分化步骤。它在固体载体上进行多达 12 个步骤,以高总产率和高立体选择性获得所需的螺缩酮,并且可以适应产品的结构变化。合成的小型 spiroketal 集合包含磷酸酶抑制剂和调节人癌细胞中微管蛋白细胞骨架形成的化合物,而不直接靶向微管。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)