Catalyst-Free C(sp<sup>2</sup>)-H Borylation through Aryl Radical Generation from Thiophenium Salts via Electron Donor–Acceptor Complex Formation
作者:Bo Li、Ke Wang、Huifeng Yue、Alwin Drichel、Jingjing Lin、Zhenying Su、Magnus Rueping
DOI:10.1021/acs.orglett.2c03008
日期:2022.10.14
of base, transition metal–ligand complex, or photoredox catalyst. Mechanistic studies reveal that this transformation is achieved through an electron donor–acceptor (EDA) complex activation in the absence of a catalyst. The mild reaction conditions allow the preparation of aromatic borates in good yields with excellent functional group tolerance. This photochemical protocol was also successfully applied
芳基硼酸酯是碳-碳键偶联的核心,广泛应用于功能材料、药物化合物和天然产物的合成。目前,芳基硼酸酯的合成方法大多局限于金属催化路线,非金属策略仍相对欠发达。在此,我们报告了在没有碱基、过渡金属-配体络合物或光氧化还原催化剂。机理研究表明,这种转化是在没有催化剂的情况下通过电子供体-受体 (EDA) 复合物活化实现的。温和的反应条件允许以良好的收率制备芳族硼酸酯,并具有优异的官能团耐受性。该光化学方案还成功应用于天然产物的后期修饰和药物中间体的合成,极大地展示了广泛的实用性。