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.
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