A Macrolactamisation-Oxazoline Ring Forming Approach towards the <i>tris</i>-Oxazole Macrolide Core in the Ulapualides
作者:James Kempson、Gerald Pattenden
DOI:10.1055/s-1999-2671
日期:1999.5
A new design for the synthesis of the 25-membered tris-oxazole macrolide core, 3, in the "ulapualide family" of marine natural products e.g. 1 isolated from nudibranchs and sponges, based on a macrolactamisation strategy, leading to 4, followed by oxazoline and oxazole ring formation using the substituted monooxazoles 5 and 6 as key precursor, is described.
A Convergent Synthesis of the <i>tris</i>-Oxazole Ring System in Ulapualide A and Related Marine Metabolites
作者:Shital Chattopadhyay、Gerald Pattenden
DOI:10.1055/s-1997-1056
日期:——
A convergent synthesis of the fully functionalised tris-oxazole system 16, found in the ulapualide family of marine macrolides, involving elaboration of the substituted oxazoles 13 and 8, followed by their coupling to the amide 14 and manipulation of the third oxazole ring via the oxazoline intermediate 15, is described.
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 ringsystem 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