Catalysis with earth‐abundant transition metals is an option to help save our rare noble‐metal resources and is especially interesting when novel reactivity or selectivity patterns are observed. We report here on a novel reaction, namely the dehydrogenative alkylation or α‐olefination of alkyl‐substituted N‐heteroarenes with alcohols. Manganese complexes developed in our laboratory catalyze the reaction
A sustainable metal-free and additive-free olefination route to <i>N</i>-heteroazaarenes from methyl-substituted heterocycles and amines
作者:Hongyi Cui、Chunyan Zhang、Yuqi Ji、Guoying Zhang
DOI:10.1039/d4ra00189c
日期:——
A green and sustainable metal-free, additive-free olefination approach is proposed for the facile synthesis of various unsaturated N-heteroazaarenes from simple methyl-substituted heteroarenes and amines. The developed protocol employs only air as the sole oxidant and provides a useful strategy for obtaining various E-selective conjugated heterocyclic olefins. This provides a useful strategy for application
提出了一种绿色且可持续的无金属、无添加剂的烯烃化方法,用于从简单的甲基取代杂芳烃和胺中轻松合成各种不饱和 N-杂芳烃。开发的方案仅使用空气作为唯一的氧化剂,并为获得各种 E 选择性共轭杂环烯烃提供了一种有用的策略。这为在一个罐中生成克数的各种不饱和 N-杂杂芳烃(高达 20.33 克)和具有高区域选择性的 STB-8(2.40 克)合成显像剂提供了一种有用的策略。
MnO2 mediated sequential oxidation/olefination of alkyl-substituted heteroarenes with alcohols
ligand-free MnO2 mediated sequentialoxidation and olefination has been developed for the facile synthesis of a broad range of unsaturated N-heteroazaarenes from simple alkyl-substituted heteroarenes and alcohols. The procedure tolerates a series of functional groups, such as methoxyl, chloro, bromo, iodo, vinyl, phenolic and hetero groups, providing the olefination products in moderate to good yields