作者:John A. O'Neill、Stephen D. Lindell、Thomas J. Simpson、Christine L. Willis
DOI:10.1039/p19960000637
日期:——
The enantioselective synthesis of the unusual 13-membered ring macrodiolide bartanol 7 from poly[(R)hydroxybutyrate] is described confirming the 6R,11R,13R configuration of the natural product. The use of a novel ylide 29 with a MEM-ester protecting group is developed to enable a mild, one-pot cleavage of both the acid and alcohol protecting groups in 30 prior to macrocyclisation to the bartanol framework. The outcome of a Wittig chain extension reaction on a mixture of lactols 19 and 22 using this ylide was found to be dependent on the solvent.
介绍了从聚[(R)羟基丁酸酯]对映选择性合成不寻常的 13 元环大环内酯巴坦酚 7 的方法,证实了天然产物的 6R、11R、13R 构型。该研究开发了一种带有 MEM 酯保护基团的新型醯化物 29,可在大环化巴坦酚框架之前,温和地一次性裂解 30 中的酸和醇保护基团。使用这种醯胺对乳醇 19 和 22 的混合物进行维蒂希链延伸反应的结果与溶剂有关。