Toward a Formal Synthesis of Laureatin: Unexpected Rearrangements Involving Cyclic Ether Nucleophiles
作者:Santosh Keshipeddy、Isamir Martı́nez、Bernard F. Castillo、Martha D. Morton、Amy R. Howell
DOI:10.1021/jo301048z
日期:2012.9.21
Laureatin, a metabolite of the red algae Laurencia nipponica, has shown potent activity as a mosquito larvicide. The two previously published syntheses of laureatin involved an initial preparation of the 8-membered cyclic ether, followed by formation of the oxetane ring. Our strategy was the reverse, i.e., to utilize an oxetane as the framework to construct the larger ring. During this work, attempted
红藻Laurencia nipponica的代谢产物Laureatin已显示出作为蚊虫杀幼虫剂的有效活性。先前发表的两种月桂苷合成方法包括最初制备8元环醚,然后形成氧杂环丁烷环。我们的策略是相反的,即以氧杂环丁烷为骨架构造更大的环。在这项工作中,试图Ñ溴代琥珀酰亚胺(NBS)氧杂环丁烷的醇环化介导17,从容易获得2- methyleneoxetane制备12,得到epoxytetrahydrofuran 19而非预期laureatin芯。进一步衍生19产生反式熔融双四氢呋喃32。描述了19和32的合成,以及结构和立体化学的阐明研究。