One-Pot Double-Annulation Strategy for the Synthesis of Unusual Fused Bis-Heterocycles
作者:Shukree Abdul-Rashed、Georgios Alachouzos、William W. Brennessel、Alison J. Frontier
DOI:10.1021/acs.orglett.0c01351
日期:2020.6.5
A novel metal-free double-annulation cascade for the construction of unusual fused heterocyclic systems is described. This simple protocol enables the sequential assembly of two rings in one pot from two simple precursors. Acidic conditions promote the condensation and the intramolecular alkynyl Prins reaction of an enyne or arenyne alcohol with a cyclic hemiaminal to form a five-, six-, or seven-membered
描述了一种新颖的无金属双环环反应级联,用于构造不寻常的稠合杂环系统。这个简单的协议使得两个简单的前体可以在一个罐中顺序组装两个环。酸性条件促进烯炔或芳烃与环状半缩醛的缩合和分子内炔基普林斯反应,形成五元,六元或七元的氧杂环,然后形成七元或八元的氮杂环。在这种转变中,在一个合成操作中形成三个新的键(一个C–O,一个C–C和一个C–N)会迅速产生化学复杂性。该策略是模块化的,相对通用,可访问一系列独特的稠合双环支架。