Lipidic polyketides: We examined the in vitro reactions catalyzed by RpsA, a bacterial typeIIIpolyketidesynthase (PKS) from Rhodospirillum centenum. RpsA is the first typeIII PKS shown to be able to efficiently accept two molecules of extender methylmalonyl‐CoA and to synthesize tetraketide compounds through aldol condensation induced by methine proton abstraction.
Total Synthesis and Configurational Validation of (+)-Violapyrone C
作者:Jong Seok Lee、Junho Shin、Hee Jae Shin、Hwa-Sun Lee、Yeon-Ju Lee、Hyi-Seung Lee、Hoshik Won
DOI:10.1002/ejoc.201402524
日期:2014.7
of tert-butyl ynoates afforded α-pyrone cores of violapyrones. Moreover, this reaction was successfully applied to the stereospecific syntheses of (+)- and (–)-violapyrone C, which allowed the absolute configuration of natural (+)-violapyrone C to be assigned by comparison of the optical rotations. This first totalsynthesis, which proceeded in 22 % yield over 10 steps from (S)-(–)-2-methylbutanol, features
Two-step, high-yielding total synthesis of antibiotic pyrones
作者:Akram Hussain、Revoju Sravanthi、Sunitha Katta、Dhevalapally B. Ramachary
DOI:10.1039/d3ob01923c
日期:——
antibiotics photopyrones, pseudopyronines, and violapyrones from bio-renewable triacetate lactone in excellent yields. These pyrones are functionally modified into another set of pyrone natural products by a single O-methylation reaction. The high-yielding gram scale synthesis of four natural products [pseudopyronine A, photopyrone A, pseudopyronine B and photopyrone C] demonstrated the viability for
开发了一种简单的两步二烷基化方案,以优异的产率从生物可再生三乙酸内酯合成生物活性抗生素光吡喃酮、假吡喃酮和紫拉吡喃酮。这些吡喃酮通过单个O-甲基化反应被功能性修饰成另一组吡喃酮天然产物。四种天然产物 [pseudopyronine A、photopyrone A、pseudopyronine B 和 photopyrone C] 的高产克级合成证明了工业应用的可行性。