A novel iron-mediated direct C–H arylation of quinones and pyridine analogues with arylboronic acids has been developed using dichloromethane and water as solvents at ambient temperature. FeS is employed and serves as an efficient catalyst. A detailed reaction mechanism is speculated and expounded.
A general transition-metal-free photoinduced acetalation-pyridylation of alkenes using diethoxyacetic acid and cyanopyridine was developed under mild conditions. By employing 4CzIPN as the photocatalyst and Cs2CO3 as the base, a diverse range of styrene derivatives and cyanopyridines worked well to give the desired products. The versatility of this method is highlighted by its application in the construction
在温和条件下开发了一种使用二乙氧基乙酸和氰基吡啶进行烯烃的一般无过渡金属光致缩醛化-吡啶化。通过使用 4CzIPN 作为光催化剂和 Cs 2 CO 3作为碱,多种苯乙烯衍生物和氰基吡啶可以很好地产生所需的产品。该方法的多功能性突出体现在其在各种官能团的构建和药物的后期修饰中的应用。重要的是,一些合成的化合物在体外显示出良好的抗肿瘤活性,表明该方案对抗肿瘤药物开发具有重要意义和潜力。
Photoinduced Radical Desulfurative C(sp<sup>3</sup>)–C(sp<sup>2</sup>) Coupling via Electron Donor–Acceptor Complexes
作者:Jiaxuan Shen、Jincan Li、Meijun Chen、Xuerong Yue、Xin Shi
DOI:10.1021/acs.orglett.4c00162
日期:2024.2.23
Herein, we disclose a radical desulfurative C–C coupling protocol for the synthesis of 4-alkylpyridines. A variety of substituents on both benzyl thiols and 4-cyanopyridines are tolerated. The reaction is carried out under mild and photocatalyst- and transition-metal-free conditions. Preliminary mechanistic studies show that an electron donor–acceptor complex is formed between benzyl thiols and 4-cyanopyridines