Ruthenium-Catalyzed Intramolecular Arene C(sp<sup>2</sup>)–H Amidation for Synthesis of 3,4-Dihydroquinolin-2(1<i>H</i>)-ones
作者:Wenlong Sun、Cho-Hon Ling、Chi-Ming Au、Wing-Yiu Yu
DOI:10.1021/acs.orglett.1c00781
日期:2021.5.7
2-dioxazol-5-ones to form dihydroquinoline-2-ones in excellent yields with excellent regioselectivity via a formal intramolecular arene C(sp2)–H amidation. The reactions of the 2- and 4-substituted aryl dioxazolones proceeds initially through spirolactamization via electrophilic amidation at the arene site, which is para or ortho to the substituent. A Hammett correlation study showed that the spirolactamization
我们报道了[Ru(对-cymene)(l-脯氨酸)Cl]([Ru1])催化的1,4,2-二恶唑-5-酮环化反应形成二氢喹啉-2-酮,具有优异的产率和极好的区域选择性通过正式的分子内芳烃C(sp 2)–H酰胺化。2-和4-取代的芳基二恶唑酮的反应首先通过在芳烃位点上的亲电酰胺化的螺内酰胺化进行,该芳烃位点对取代基是对位的或邻位的。Hammett相关性研究表明,螺内酰胺化可能是由于对苯丙氨酸的亲电子亚硝基化合物攻击而发生的,其特征是-0.73的负ρ值。