Towards a total synthesis of ulapualide A. Concise synthetic routes to the tris-oxazole ring system and tris-oxazole macrolide core in ulapualides, kabiramides, halichondramides, mycalolides and halishigamides
作者:Shital K. Chattopadhyay、James Kempson、Alan McNeil、Gerald Pattenden、Michael Reader、David E. Rippon、David Waite
DOI:10.1039/b000750l
日期:——
the synthesis of mono-, bis- and tris-2,4-disubstituted oxazoles were evaluated, which led ultimately to a concise synthesis of the three contiguous oxazole ring system 26 in the ulapualide family of 25-membered macrolides, e.g.1, found in marine organisms. The tris-oxazole macrolide core 30 in ulapualide A (1) was also synthesised based on a macrolactamisation strategy from the two functionalised mono-oxazole
一系列合成单,双和三,2,4-二取代的方法 恶唑类被评估,最终导致25个成员的ulapualide家族中三个连续的恶唑环系统26的简明合成大环内酯类,例如1,存在于海洋生物中。ulapualide A(1)中的tris- oxazole大环内酯类药物核心30也基于大内酰胺化策略从两种功能化化合物中合成而成。一恶唑前体28和29,其次是恶唑啉 45和恶唑环的形成,利用在18和26的形成中线性双-和三-恶唑的合成中建立的方法。将三恶唑26转化为相应的phospho盐5,以准备将其制成乌拉泊肽A(1)。