已开发出一种用于将多种简单和杂环芳烃与芳基碘化物、溴化物和氯化物进行分子内直接芳基化的催化剂。这些反应以极好的收率发生并且具有高度选择性。对芳基碘化物底物的研究表明,由于碘化物在反应介质中的积累,会发生催化剂中毒。这可以通过添加银盐来克服,银盐也允许这些反应在较低温度下发生。该方法的效用通过咔唑天然产物的快速合成和通过直接芳基化产物的开环反应合成空间位阻四邻位取代的联芳基来说明。机理研究提供了对催化剂的深入了解 s 作用模式并显示在钯催化的简单芳烃的直接芳基化中存在动力学上显着的 CH 键裂解。从这些研究中获得的知识导致了以前无法获得的芳烃的新分子间芳基化反应的发展,为其他新的直接芳基化过程的发展打开了大门。
A method for constructing a phenanthridinone skeleton frequently found in bioactive substances without using transition metals was developed. This reaction proceeds through photooxidative C–H amidation with visiblelight irradiation, and commercially available organophotocatalyst. Using this synthetic method phenanthridinones are afforded under mild conditions at low cost.
Nickel-Catalyzed Cross-Electrophile Coupling between C(sp<sup>2</sup>)–F and C(sp<sup>2</sup>)–Cl Bonds by the Reaction of <i>ortho</i>-Fluoro-Aromatic Amides with Aryl Chlorides
作者:Itsuki Nohira、Naoto Chatani
DOI:10.1021/acscatal.1c01102
日期:2021.4.16
between C(sp2)–Fbonds in ortho-fluoro-substituted aromatic amides and C(sp2)–Cl bonds in aryl chlorides in the presence of Zn as a reductant and LiOtBu as a base, and LiCl and ZnCl2 as additives is reported. The reaction displayed excellent functional group tolerance and a broad substrate scope. The reaction was also applicable to cross-electrophile coupling between C(sp2)–F and C(sp2)–O bonds in an
在锌为还原剂和LiO t Bu为原子的情况下,邻氟取代的芳族酰胺中的C(sp 2)-F键与芳基氯中的C(sp 2)-Cl键之间的镍催化交叉亲电子偶联。据报道,LiCl和ZnCl 2作为添加剂。该反应显示出优异的官能团耐受性和广泛的底物范围。该反应也适用于甲苯磺酸芳基酯和三氟甲磺酸酯衍生物中C(sp 2)–F和C(sp 2)–O键之间的亲电子交联。
Nickel-Catalyzed Denitrogenative Annulation of 1,2,3-Benzotriazin-4-(3<i>H</i>
)-ones with Benzynes for Construction of Phenanthridinone Scaffolds
作者:Vijaykumar H. Thorat、Nitinkumar Satyadev Upadhyay、Masahiro Murakami、Chien-Hong Cheng
DOI:10.1002/adsc.201701143
日期:2018.1.17
The synthesis of phenanthridinones via denitrogenative annulation of 1,2,3‐benzotriazin‐4‐(3H)‐ones with arynes catalysed by Ni(0)/dppm was successfully developed. A variety of phenanthridinones were prepared in good to excellent yields. Based on this method, nature product, N‐methylcrinasidine, was synthesized.
An efficient synthesis of free (NH)-phenanthridinones through Pd-catalyzed C(sp(2))-H aminocarbonylation of unprotected o-arylanilines under an atmospheric pressure of CO has been developed. Some ortho heteroarene substituted anilines as well as N-alkyl protected o-arylanilines are also suitable substrates for this C-H aminocarbonylation reaction.
The present invention relates to a novel class of selective estrogen receptor modulators (SERMs). The SERM compounds are applicable for use in the prevention and/or treatment of a variety of diseases and conditions including prevention and treatment of cancers such as prostate and breast cancer, osteoporosis, hormone-related diseases, hot flashes or vasomotor symptoms, neurological disorders, cardiovascular disease and obesity.