Brønsted-base-catalyzed remote cascade reactivity of 2,4-dienones – asymmetric synthesis of tetrahydrothiophenes
作者:Artur Przydacz、Rafał Kowalczyk、Łukasz Albrecht
DOI:10.1039/c7ob02397a
日期:——
developed cascade involving 1,6-addition followed by the intramolecular aldol reaction provides a straightforward access to polysubstituted tetrahydrothiophene derivatives of biological and synthetic importance. Target products, bearing three contiguous stereocenters including one quaternary, have been obtained with excellent yields (up to 98%) and with good to high stereocontrol (>20:1 dr, up to 97:3
这项研究表明,利用布朗斯台德碱催化可以实现2,4-二烯酮的远程级联官能化。涉及1,6-加成然后分子内羟醛反应的发达级联反应提供了直接获得具有生物学和合成重要性的多取代四氢噻吩衍生物的途径。获得了具有三个连续立体中心(包括一个四级)的目标产物,具有优异的收率(高达98%)和良好的至高立体控制(> 20:1 dr,高达97:3 er),并且通过以下反应促进了级联反应简单易用的金鸡纳生物碱金鸡宁。