A new aminocyclitol derived frombicyclo[4.2.01,6]octane was synthesized starting fromcyclooctatetraene. Photooxygenation of trans-7,8-diacetoxy-bicyclo[4.2.0]octa-2,4-diene afforded a bicyclic endoperoxide. Reduction of the endoperoxide with thiourea followed by a palladium-catalyzed ionization/cyclization reaction gave an oxazolidinone derivative. Oxidation of the double bond in the oxazolidinone
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。
Synthesis of a new class of aminocyclitol analogues with the conduramine D-2 configuration
作者:Latif Kelebekli、Yunus Kara、Murat Celik
DOI:10.3762/bjoc.6.15
日期:——
aminocyclitol derivatives with the bicyclo[4.2.0]octane skeleton was synthesized starting fromcyclooctatetraene. Photooxygenation of trans-7,8-diacetoxy- and cis-7,8-dichlorobicyclo[4.2.0]octa-2,4-diene afforded the bicyclic endoperoxides. Reduction of the latter with thiourea followed by a Pd(0) catalyzed ionization/cyclization reaction gave the corresponding oxazolidinone derivatives. Oxidation of