<i>N</i>-Methylphenothiazine <i>S</i>-Oxide Enabled Oxidative C(sp<sup>2</sup>)–C(sp<sup>2</sup>) Coupling of Boronic Acids with Organolithiums via Phenothiaziniums
作者:Tatsuki Yoshida、Yuki Honda、Tatsuya Morofuji、Naokazu Kano
DOI:10.1021/acs.orglett.1c03986
日期:2021.12.17
we report the development of a transition-metal-free oxidative C(sp2)–C(sp2) coupling of readily available boronic acids and organolithiums via phenothiazinium ions. Various biaryl, styrene, and diene derivatives were obtained using this reaction system. The key to this process is N-methylphenothiazine S-oxide (PTZSO), which allows efficient conversion of boronic acids to phenothiazinium ions. The mechanism
在此,我们报告了通过吩噻嗪离子将易得的硼酸和有机锂进行无过渡金属氧化 C(sp 2 )–C(sp 2 ) 偶联的发展。使用该反应体系获得了各种联芳基、苯乙烯和二烯衍生物。该过程的关键是N-甲基吩噻嗪S-氧化物 (PTZSO),它可以有效地将硼酸转化为吩噻嗪离子。使用理论计算和实验研究了使用 PTZSO 形成吩噻嗪的机制,从而深入了解 PTZSO 的独特反应性。