Palladium-catalysed cyclisation of alkenols: Synthesis of oxaheterocycles as core intermediates of natural compounds
作者:Miroslav Palík、Jozef Kožíšek、Peter Koóš、Tibor Gracza
DOI:10.3762/bjoc.10.216
日期:——
and/or bicyclic oxaheterocyclic derivatives depending on a starting alkenol. The substrate scope and proposed mechanism of Pd-catalysed cyclisation reactions are also discussed. Moreover, the diastereoselective Pd-catalysed cyclisation of appropriate alkenols to tetrahydrofurans and subsequent cyclisation provided properly substituted 2,5-dioxabicyclo[2.2.1]heptane and 2,6-dioxabicyclo[3.2.1]octane
报道了使用不同催化体系对 Pd 催化的烯醇环化反应的研究。这些转化影响取决于起始烯醇的单环和/或双环氧杂环衍生物的立体选择性构建。还讨论了 Pd 催化的环化反应的底物范围和提出的机制。此外,非对映选择性 Pd 催化的适当烯醇环化成四氢呋喃和随后的环化分别提供了适当取代的 2,5-二氧杂双环 [2.2.1] 庚烷和 2,6-二氧杂双环 [3.2.1] 辛烷。这种双环亚基存在于许多天然产物中,包括 ocellenynes 和 aurovertines。