Total Synthesis and Absolute Configuration of Epicoccamide D, a Naturally Occurring Mannosylated 3-Acyltetramic Acid
作者:Sebastian Loscher、Rainer Schobert
DOI:10.1002/chem.201301914
日期:2013.8.5
The endofungal metabolite epicoccamide D was synthesised in eighteen steps and 17 % yield as the first member of the family of natural glycotetramic acids. The modular character of the synthesis opens access also to analogues featuring different sugars and spacers. It comprises several high‐yielding key steps. The β‐D‐mannosyl group was introduced by using an α‐D‐glucosyl imidate donor with subsequent
作为天然糖四酸家族的第一个成员,用十八个步骤合成了真菌内代谢物表球菌酰胺D,产率为17%。合成的模块化特征也使人们可以使用具有不同糖和间隔基的类似物。它包含几个高收益的关键步骤。所述β- d -mannosyl组通过使用α-引入d -glucosyl亚氨酸酯与随后的氧化还原性差向异构化的供体在C-2'。吡咯烷环通过N-(β-酮酰基)-N-丙氨酸丙氨酸的Lacey-Dieckmann缩合定量关闭。将所得的3- [ω-(β- d -mannosyl)十八碳-2-烯酰基]特特拉姆酸是在铑催化剂的存在下(氢化ř,R)-[Rh(Et-DUPHOS)] [BF 4 ]建立(7 S)-立体中心。仅在将酰基四酸作为BF 2螯合物封端以防止金属催化剂被捕获后才有可能。我们还分配了天然产品的迄今未知的结构为5小号,7小号通过其的比较13 C NMR光谱和光学旋转数据与我们的两种合成5的小号,7 - [R / š
Total synthesis of the Fusarium toxin equisetin
作者:Lisa T. Burke、Darren J. Dixon、Steven V. Ley、Félix Rodríguez
DOI:10.1039/b411350k
日期:——
A short stereoselective synthesis of the Fusariumtoxinequisetin, a potent inhibitor of HIV-1 integrase enzyme is described, using as the key step a stereoselective intramolecular Diels-Alder reaction of a fully conjugated E,E,E-triene with a trisubstituted gamma,delta-unsaturated beta-ketothioester.