Two sequential nickel-catalyzed reactions allow the preparation of highly functionalized alkylidene cyclohexenols. Dehydration of the resulting cycloadducts allows the preparation of densely functionalized aromatic ring systems, whereas a simple sequence involving oxidation followed by carbonyl addition or enolization allows additional diversity incorporation.
Access to <i>Z</i>-Selective 1,3-Enynes via Ni-Catalyzed Intermolecular Cross-Alkylalkynylation of Terminal Alkynes
作者:Nan Xiao、Yi-Zhou Zhan、Huan Meng、Wei Shu
DOI:10.1021/acs.orglett.1c01728
日期:2021.7.2
facile synthesis of stereodefined 1,3-conjugated enynes via Ni-catalyzed intermolecular cross-alkylalkynylation of alkynes with unsaturated carbonyl compounds and alkynes or alkynyl silicates. The operational simple protocol proceeds at room temperature and tolerates a wide range of functional groups, providing an attractive alternative to carbonyl-tethered trisubstituted conjugated 1,3-enynes from easily
获得具有明确立体选择性的 1,3-共轭烯炔是非常理想和具有挑战性的。在此,我们报告了通过 Ni 催化的炔烃与不饱和羰基化合物和炔烃或炔基硅酸盐的分子间交叉烷基炔基化,轻松合成立体定义的 1,3-共轭烯炔。操作简单的协议在室温下进行,并且可以容忍广泛的官能团,为来自易于获得的起始材料的羰基束缚的三取代共轭 1,3-烯炔提供了一种有吸引力的替代方案。