Towards γ-Rubromycin: Model Studies, Development of a C<sub>3</sub>Building Block, and Synthesis of 4′-Silyl-γ-rubromycin
作者:Michael Wilsdorf、Hans-Ulrich Reissig
DOI:10.1002/ejoc.201601224
日期:2016.12
system. Herein, we report our strategy towards this class of natural products, that led to the identification of an electronically well-balanced spiroketalization precursor and eventually culminated in the preparation of an unnatural 4′-silyl-substituted γ-rubromycin derivative in racemic form. In the course of this study, we additionally introduced a new type of γ-silylated allylic phosphonate reagents
人端粒酶抑制剂 γ-红霉素属于一类天然产物,其特征是罕见的 [5,6]-双苯并缩酮核作为其中心结构基序。这些支架也被称为“芳香螺酮”,对全合成提出了巨大的挑战。通过酸介导的 spiroketalization 事件的理想方法要求很高,因为这种转变很容易受到多环系统上即使是轻微的电子变化的影响。在这里,我们报告了我们对这类天然产物的策略,这导致了电子平衡的螺酮缩酮前体的鉴定,并最终以外消旋形式制备了非天然的 4'-甲硅烷基取代的 γ-红霉素衍生物。在这项研究过程中,