Synthesis of the Anti-HIV Agent (−)-Hyperolactone C by Using Oxonium Ylide Formation-Rearrangement
作者:David M. Hodgson、Stanislav Man
DOI:10.1002/chem.201101082
日期:2011.8.22
Starting from readily available (S)‐styrene oxide an asymmetric synthesis is described of the naturally occurring anti‐HIV spirolactone (−)‐hyperolactone C, which possesses adjacent fully substituted stereocenters. The key step involves a stereocontrolled RhII‐catalysed oxonium ylide formation–[2,3] sigmatropic rearrangement of an α‐diazo‐β‐ketoester bearing allylic ether functionality. From the resulting
从易于获得的(S)-环氧乙烷开始,描述了天然存在的抗HIV螺内酯(-)-高内酯C的不对称合成,该化合物具有相邻的完全取代的立体中心。关键步骤涉及立体控制的Rh II催化的氧鎓叶立德形成–带有烯丙基醚官能团的α-重氮-β-酮酸酯的[2,3]σ重排。从生成的呋喃酮中,经酸催化的内酯化和脱氢得到天然产物。