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。
CuI/Oxalamide Catalyzed Couplings of (Hetero)aryl Chlorides and Phenols for Diaryl Ether Formation
作者:Mengyang Fan、Wei Zhou、Yongwen Jiang、Dawei Ma
DOI:10.1002/anie.201601035
日期:2016.5.17
Couplings between (hetero)arylchlorides and phenols can be effectively promoted by CuI in combination with an N‐aryl‐N′‐alkyl‐substituted oxalamide ligand to proceed smoothly at 120 °C. For this process, N‐aryl‐N′‐alkyl‐substituted oxalamides are more effective ligands than bis(N‐aryl)‐substituted oxalamides. A wide range of electron‐rich and electron‐poor aryl and heteroaryl chlorides gave the corresponding
irradiation from a compact fluorescent lamp, low-intensity UV lamp, or sunlight. This protocol can be applied to the synthesis of perfluoroalkyl-substituted phenanthridines as well as effect the iodo-perfluoroalkylation of alkenes/alkynes and the C–H perfluoroalkylation of electron-rich arenes and heteroarenes. This C–H perfluoroalkylation reaction offers a unique method for site-selective labeling of oligopeptides
CuI/Oxalic Diamide Catalyzed Coupling Reaction of (Hetero)Aryl Chlorides and Amines
作者:Wei Zhou、Mengyang Fan、Junli Yin、Yongwen Jiang、Dawei Ma
DOI:10.1021/jacs.5b08411
日期:2015.9.23
A class of oxalic diamides are found to be effective ligands for promoting CuI-catalyzed aryl amination with less reactive (hetero)aryl chlorides. The reaction proceeds at 120 °C with K3PO4 as the base in DMSO to afford a wide range of (hetero)aryl amines in good to excellent yields. The bis(N-aryl) substituted oxalamides are superior ligands to N-aryl-N'-alkyl substituted or bis(N-alkyl) substituted
发现一类草酸二酰胺是促进 CuI 催化的芳基胺化与反应性较低的(杂)芳基氯化物的有效配体。该反应在 120 °C 下以 K3PO4 作为碱在 DMSO 中进行,以良好到极好的收率提供范围广泛的(杂)芳基胺。双(N-芳基)取代的草酰胺是优于N-芳基-N'-烷基取代或双(N-烷基)取代的草酰胺的配体。配体中芳环的电子性质和空间性质对其效率都很重要。