Ring-Closing Metathesis and Photo-Fries Reaction for the Construction of the Ansamycin Antibiotic Kendomycin: Development of a Protecting Group Free Oxidative Endgame
作者:Thomas Magauer、Harryâ
J. Martin、Johann Mulzer
DOI:10.1002/chem.200902226
日期:2010.1.11
total syntheses of the ansa‐polyketide (−)‐kendomycin (1) are described. The syntheses benefit from the use of readily available and cheap starting materials. Highly complex diastereoselective Claisen–Ireland rearrangements were used to introduce the (E)‐double bond and the C16‐Me group. The ring closure of the strained ansa macrocycle was achieved by ring‐closing metathesis and a highly efficient combination
的两个会聚全合成柄型( - ) - kendomycin(-polyketide 1)中有所描述。合成得益于使用容易获得的廉价原料。高度复杂的非对映选择性克莱森-爱尔兰重排用于引入(E)-双键和C16-Me基团。紧张的ansa大环的闭环是通过闭环易位以及大内酯化和光爆反应的高效结合而实现的。经由不稳定的保护基自由最后阶段ö -quinone被呈现。另外,描述了针对1的总合成的一些不成功的合成努力。