介绍了一种通过逐步钌催化的 C-H 芳基化和钾介导的还原性环化脱氢从 2-苯基吡啶和芳基溴化物合成二苯并 [f, h] 喹啉及其衍生物的方法。一种二苯并[ f , h ] 喹啉衍生物被用作双齿配体来制备环金属化的钌络合物。通过单晶 X 射线结构分析表征了两种二苯并 [ f , h ] 喹啉化合物和钌络合物。
Nickel-Catalyzed Suzuki–Miyaura Reaction of Aryl Fluorides
摘要:
Two protocols for the nickel-catalyzed cross-coupling of aryl fluorides with aryl boronic esters have been developed. The first employs metal fluoride cocatalysts, such as ZrF4 and TiF4, which enable Suzuki-Miyaura reactions of aryl fluorides bearing electron-withdrawing (ketones, esters, and CF3), aryl and alkenyl groups as well as those comprising fused aromatic rings, such as fluoronaphthalenes and fluoroquinolines. The second protocol employs aryl fluorides bearing ortho-directing groups, which facilitate the difficult C-F bond activation process via cyclometalation. N-heterocycles, such as pyridines, quinolines, pyrazoles, and oxazolines, can successfully promote cross-coupling with an array of organoboronic esters. A study into the substituent effects with respect to both coupling components has provided fundamental insights into the mechanism of the nickel-catalyzed cross-coupling of aryl fluorides.
Iron catalyzed oxidative assembly of N-heteroaryl and aryl metal reagents using oxygen as an oxidant
作者:Kun Ming Liu、Lian Yan Liao、Xin Fang Duan
DOI:10.1039/c4cc08494b
日期:——
An equivalent amount of N-heteroaryl and aryl Grignard or lithium reagents, after mediation by an equivalent of titanate, was facilely coupled to furnish N-heteroaryl-aryl compounds under the catalysis of FeCl3/TMEDA at ambient temperature usingoxygen as an oxidant. Most of the common N-heteroaryls were all good candidates, and thus provided a general, green and pratical protocol for the flexible
Combined photochemical arylation, “nuisance effect” (SNAr) reaction sequences have been employed in the design of small arrays for immediate deployment in medium‐throughput X‐ray protein–ligand structure determination. Reactions were deliberately allowed to run “out of control” in terms of selectivity; for example the ortho‐arylation of 2‐phenylpyridine gave five products resulting from mono‐ and bisarylations
组合光化学芳基化、“滋扰效应”( SN Ar)反应序列已被用于设计小型阵列,以便立即部署在中等通量 X 射线蛋白质-配体结构测定中。故意让反应在选择性方面“失控”;例如,2-苯基吡啶的邻位芳基化得到单芳基化和双芳基化与SNA Ar 工艺相结合的五种产物。结果,已经鉴定出许多针对 NUDT7(一种关键的过氧化物酶体 CoA 酯水解酶)的晶体学命中。
Bulky Phosphane Ligand for Monoselective Ruthenium-Catalyzed, Directed o-C–H Arylation with Challenging Aryl Chlorides
more economically attractive but usually much more difficult as substrates in metal-mediated couplings than the corresponding bromides and iodides. A catalyst prepared from a bulky (biaryl)diphenyl phosphane and a common ruthenium source (1:1) mediates selective direct monoarylations of arenes bearing 2-pyridyl and related ortho-directing groups in good yields. Sequential arylations to heterodiarylated
Ruthenium-Catalyzed Direct C–H Bond Arylations of Heteroarenes
作者:Lutz Ackermann、Alexander V. Lygin
DOI:10.1021/ol2010648
日期:2011.7.1
Ruthenium-catalyzedC–Hbondarylations of indoles, thiophenes, and pyrroles were accomplished in a highly chemo- and site-selective manner through the use of removable directing groups.
Solvent and Base in One: Tetra-<i>n</i>
-butylammonium Acetate as a Multi-Purpose Ionic Liquid Medium for Ru-Catalyzed Directed Mono- and Di-<i>o</i>
-C-H Arylation Reactions
作者:Ya-Ling Zou、Zhen-Yu Wang、Yin-Mao Feng、You-Gui Li、Eric Assen B. Kantchev
DOI:10.1002/ejoc.201701022
日期:2017.11.16
Bu4NOAc can be a multi-purpose medium for a Ru-catalyzed directed o-C–H arylation reaction with functionalized aryl bromides. Acetate plays the role of base and Bu4N salts (excess acetate and side product bromide) behave as ionicliquids. The medium is compatible with both RuCl3·xH2O (major product: di-arylation) and [RuCl2(p-cymene)]2/(p-Tol)3P catalytic systems (major product: mono-arylation).
Bu 4 NOAc可以是多官能团介质,用于Ru催化的与官能化芳基溴化物进行的定向o -C–H芳基化反应。乙酸盐起碱的作用,Bu 4 N盐(过量的乙酸盐和副产物溴化物)起离子液体的作用。该介质与RuCl 3 · x H 2 O(主要产物:二芳基化)和[RuCl 2(p- cymene)] 2 /(p -Tol)3 P催化系统兼容(主要产物:单芳基化) 。