Selective Synthesis of Dihydrophenanthridine and Phenanthridine Derivatives from the Cascade Reactions of <i>o</i>-Arylanilines with Alkynoates through C–H/N–H/C–C Bond Cleavage
作者:Yuanshuang Xu、Caiyun Yu、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.1c00256
日期:2021.4.16
unprecedented selective synthesis of dihydrophenanthridine and phenanthridinederivatives through the cascade reactions of 2-arylanilines with alkynoates is presented. Mechanistic studies showed that the formation of the dihydrophenanthridine scaffold involves an initial C(sp2)–H alkenylation of 2-arylaniline with alkynoate followed by an intramolecular aza-Michael addition. When this reaction is carried out
Nickel-Catalyzed Enantioselective Synthesis of Pre-Differentiated Homoallylic <i>syn</i>- or <i>anti</i>-1,2-Diols from Aldehydes and Dienol Ethers
作者:Thomas Q. Davies、John J. Murphy、Maxime Dousset、Alois Fürstner
DOI:10.1021/jacs.1c07042
日期:2021.9.1
Nickelcatalysis allied with cyclodiphosphazane or VAPOL-derived phosphoramidite ligands provides selective access to monoprotected vicinal diols by reductive coupling of dienol ethers and aldehydes. The observed regioselectivity is unprecedented, in that the diene reacts at the least nucleophilic and most hindered C atom that is attached to the oxygen substituent rather than at the terminal position
镍催化与环二磷氮烷或 VAPOL 衍生的亚磷酰胺配体结合,通过二烯醇醚和醛的还原偶联提供对单保护的邻二醇的选择性访问。观察到的区域选择性是前所未有的,因为二烯在亲核性最低且受阻最大的 C 原子上反应,该 C 原子连接到氧取代基而不是在末端位置。值得注意的是,产品的顺式和反式非对映异构体都可以根据二烯伙伴的配置获得,通常具有出色的非对映选择性和对映选择性。
6-Aroylated Phenanthridines via Base Promoted Homolytic Aromatic Substitution (BHAS)
作者:Dirk Leifert、Constantin Gabriel Daniliuc、Armido Studer
DOI:10.1021/ol403147v
日期:2013.12.20
2-isocyanobiphenyls react with aromatic aldehydes via base promoted homolytic aromatic substitution (BHAS) to give 6-aroylated phenanthridines. Reactions occur via addition of acylradicals to the isonitrile functionality and subsequent intramolecular BHAS of the intermediate imidoyl radicals. Initiation of the radicalchainreaction is best achieved with small amounts of FeCl3 (0.4 mol %), and the commercially
Copper-Catalyzed C–H Azidation of Anilines under Mild Conditions
作者:Conghui Tang、Ning Jiao
DOI:10.1021/ja3089907
日期:2012.11.21
A novel and efficient copper-catalyzed azidation reaction of anilines via C-H activation has been developed. This method, in which the primary amine acts as a directing group by coordinating to the metal center, provides ortho azidation products regioselectively undermildconditions. This effective route for the synthesis of aryl azides is of great significance in view of the versatile reactivity
Novel iridium-based Ir(III) luminescent complexes, conjugates comprising these complexes as a label and their application, for example in the electrochemiluminescence based detection of an analyte.