Total Synthesis of Tiacumicin B: Implementing Hydrogen Bond Directed Acceptor Delivery for Highly Selective β‐Glycosylations
作者:Stéphanie Norsikian、Cedric Tresse、Marc François‐Eude、Louis Jeanne‐Julien、Guillaume Masson、Vincent Servajean、Grégory Genta‐Jouve、Jean‐Marie Beau、Emmanuel Roulland
DOI:10.1002/anie.202000231
日期:2020.4.16
A total synthesis of tiacumicin B, a natural macrolide whose remarkable antibiotic properties are used to treat severe intestinal infections, is reported. The strategy is in part based on the prior synthesis of the tiacumicin B aglycone, and on the decisive use of sulfoxides as anomeric leaving groups in hydrogen‐bond‐mediated aglycone delivery (HAD). This new HAD variant permitted highly β‐selective
据报道,头孢菌素B是一种天然的大环内酯类化合物,具有显着的抗生素特性,可用于治疗严重的肠道感染,可以完全合成。该策略部分基于预先合成的头孢菌素B糖苷配基,以及在氢键介导的糖苷配基递送(HAD)中亚砜作为异头离去基团的决定性使用。这个新的HAD变体允许高度β-选择性鼠李糖基化和壬基糖基化。为了增加收敛性,通过适应用于糖苷配基合成的Suzuki-Miyaura交叉偶联,将如此获得的鼠李糖基化的C1-C3片段锚定在C4-C19糖苷配基片段上。环尺寸选择性大环内酯化作用使化合物直接参与了noviolysation步骤,具有几乎全部的β选择性。