Roxaticin has been synthesized in a convergent manner from the polyol segment 2, which was prepared by the Julia coupling reaction of sulfone 4 and aldehyde 8, and the polyene phosphonate 3. The cyclization was achieved by macrolactonization.
Roxaticin has been synthesized in a convergent manner. The polyol and polyene fragments were coupled by Horner-Emmons reaction and the cyclization was achieved by macrolactonization.
罗沙汀已经以收敛的方式合成。多元醇和多烯片段通过霍纳-埃蒙斯反应耦合,并且通过大内酯化实现环化。
Total Synthesis of RK-397
作者:Scott E. Denmark、Shinji Fujimori
DOI:10.1021/ja052226d
日期:2005.6.1
An enantioselective synthesis of the polyene macrolideRK-397 is described. The use of the same eight-carbon building block twice for the construction of the polyol chain allowed for a highly convergent synthesis. The synthesis highlights stereoselective vinylogous aldol addition using a chiral bisphosphoramide as well as a sequential palladium-catalyzed cross-coupling reaction for the preparation
Two-directional chain synthesis: an application to the synthesis of (+)-mycoticin A
作者:Christopher S. Poss、Scott D. Rychnovsky、Stuart L. Schreiber
DOI:10.1021/ja00061a057
日期:1993.4
Synthesis of the Antifungal Macrolide Antibiotic (+)-Roxaticin
作者:David A. Evans、Brian T. Connell
DOI:10.1021/ja027638q
日期:2003.9.1
The total synthesis of the antifungal macrolide antibiotic roxaticin has been accomplished. The synthesis relies principally on aldol and directed reduction steps to construct the extended 1,3-polyol array present in the natural product. Three principal nonpolyene containing fragments were assembled and then coupled usingJuliaolefination and methyl ketone aldol addition reactions. A series of functionalization
已完成抗真菌大环内酯类抗生素roxaticin的全合成。合成主要依赖于羟醛和定向还原步骤来构建存在于天然产物中的扩展 1,3-多元醇阵列。组装了三个主要的含非多烯的片段,然后使用 Julia 烯化和甲基酮醛醇加成反应偶联。一系列功能化反应结合了敏感的多烯,并提供了受保护的罗沙辛二环酸,该酸以良好的收率内酯化。酸性脱保护完成了 roxaticin 的这种会聚合成。