Gold(I)-catalysed intramolecular hydroamination of α-quaternary alkynes: synthetic studies towards spiroimine marine toxins
作者:Yanchuan C. Zhang、Daniel P. Furkert、Stéphanie M. Guéret、Fanny Lombard、Margaret A. Brimble
DOI:10.1016/j.tetlet.2011.07.048
日期:2011.9
Cyclic spiroimines form an essential component of the bioactive pharmacophore in a number of potent fast-acting marine biotoxins, including the pinnatoxins, gymnodimine and the spirolides. These present a significant challenge for the total synthesis of this class of natural products. A novel approach to these cyclic spiroimines based on metal-catalysed hydroamination of spiroaminoalkyne precursors
在许多有效的速效海洋生物毒素中,环状螺螺胺是生物活性药效团的重要组成部分,其中包括品纳毒素,裸草胺和螺环内酯。这些对于这类天然产物的全合成提出了重大挑战。本文报道了基于金属催化的螺氨基炔炔前体的氢化胺化这些环状螺亚胺的新颖方法。发现Au(PPh 3)SbF 6以高产率实现板凳稳定的5,6-和6,6-螺亚胺体系的形成,尽管7,6-类似物仍然难以捉摸。据我们所知,这是第一个报道的通过炔烃加氢胺化形成的α-季环亚胺的实例。