Stereoselective synthesis of trans-THF rings using an oxidative cyclisation-radical deoxygenation sequence: application to the formal synthesis of trans-(2R,5R)-linalool oxide
作者:Nadeem S. Sheikh
DOI:10.1039/c4ra13258k
日期:——
An efficient stereoselective synthesis of cis-2,5-disubtituted tetrahydrofuran (THF) diols has been achieved using permanganate-mediated oxidative cyclisation of 1,5-diene precursors. The facial selectivity during the course of cyclisation was induced by incorporating conveniently accessible chiral auxiliaries such as (2R)-10,2-camphorsultam, (S)-4-benzyloxazolidin-2-one and (−)-8-phenylmenthol. The
使用高锰酸盐介导的1,5-二烯前体的氧化环化反应,可以实现顺式-2,5-二取代的四氢呋喃(THF)二醇的高效立体选择性合成。环化过程中的面部选择性是通过掺入方便可得的手性助剂,如(2 R)-10,2-樟脑舒马坦,(S)-4-苄基恶唑烷-2-一和(-)-8-苯基薄荷醇来诱导的。使用(2 - [R)-10,2樟脑得到所需THF的产物,为单一的非对映体分离。提出构象分析以合理化面部选择性的起源和对成功完成顺式转化的综合研究-2,5-二取代的THF二醇成相应的反式-THF化合物也被描述,导致的立体选择性合成正式反式- (2- [R,5 - [R)-linalool氧化物。