Organocatalytic Strategy for the Enantioselective Cycloaddition to Trisubstituted Nitroolefins to Create Spirocyclohexene-Oxetane Scaffolds
作者:Alicia Monleón、Florian Glaus、Stefania Vergura、Karl Anker Jørgensen
DOI:10.1002/anie.201510731
日期:2016.2.12
excellent selectivities. This strategy also enabled access to chiral spirocyclohexene‐cyclobutanes and ‐azetidines. Additionally, the obtained scaffolds can undergo diverse transformations leading to complex structures with up to four stereocenters, and we demonstrate that the nitro group, under nucleophilic conditions, can be applied for ring‐opening of the oxetane.
报道了对α,β,β-三取代硝基烯烃的第一个催化对映选择性环加成反应。为此,将硝基烯烃氧杂环丁烷与三烯胺催化促进的2,4-二烯醛反应。这种方法学为合成具有两个相邻的四取代碳原子的高官能度手性螺环己烯-氧杂环丁烷提供了一种简便有效的策略,该方法具有高收率和出色的选择性。该策略还使得能够获得手性螺环己烯-环丁烷和氮杂环丁烷。此外,获得的支架可以经历多种转化,从而形成具有多达四个立体中心的复杂结构,并且我们证明了在亲核条件下,硝基可以用于氧杂环丁烷的开环。