作者:Kangning Cao、Siu Min Tan、Richmond Lee、Songwei Yang、Hongshao Jia、Xiaowei Zhao、Baokun Qiao、Zhiyong Jiang
DOI:10.1021/jacs.9b00286
日期:2019.4.3
Pyridine, one of the most important azaarenes, is ubiquitous in functional molecules. The electronic properties of pyridine have been exploited to trigger asymmetric transformations of prochiral species as a direct approach for accessing chiral pyridine derivatives. However, the full potential of this synthetic strategy for the construction of enantioenriched γ-functionalized pyridines remains untapped
吡啶是最重要的氮杂芳烃之一,在功能分子中无处不在。吡啶的电子特性已被用于触发前手性物质的不对称转化,作为获得手性吡啶衍生物的直接方法。然而,这种用于构建对映体富集的 γ 功能化吡啶的合成策略的全部潜力仍未开发。在这里,我们描述了在可见光介导的协同光氧化还原和不对称催化下,前手性自由基对乙烯基吡啶的首次对映选择性加成。乙烯基吡啶与醛、酮和亚胺的对映选择性还原偶联是通过使用手性布朗斯台德酸激活反应伙伴并通过氢键相互作用提供立体控制来实现的。