(<i>t</i>-Bu)<sub>2</sub>PNP(<i>i</i>-BuNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N: New Efficient Ligand for Palladium-Catalyzed C−N Couplings of Aryl and Heteroaryl Bromides and Chlorides and for Vinyl Bromides at Room Temperature
作者:Ch. Venkat Reddy、Jesudoss V. Kingston、John G. Verkade
DOI:10.1021/jo702367k
日期:2008.4.1
chlorides possessing base-sensitive substituents (nitro, ester, and keto) provide coupling products with bulky aryl amines in good to excellent yields. Aryl halides possessing other functional groups including cyano, amino, trifluoromethyl, and phenol, coupled with equal ease, producing highly functionalized amines in good to excellent yields. Moreover, an aryl chloro group can be preserved in the presence
Single-Step Synthesis of Dinuclear Neutral Gold(I) Complexes with Bridging Di(N-heterocyclic carbene) Ligands and Their Catalytic Performance in Cross Coupling Reactions and Alkyne Hydroamination
We report on a single-step procedure for the synthesis of dinuclear gold(I) complexes with bridging di(N-heterocyclic carbene) (diNHC) ligands of general formula Au2Br2L1–9 (L = diNHC). The obtained complexes differ in the bridging group between the carbene donors and in the terminal wingtip substituents at the imidazol-2-ylidene rings. The complexes have been characterized by means of elemental analysis
我们报告了一步法合成具有桥接式通式Au 2 Br 2 L 1 – 9的二(N-杂环卡宾)(diNHC)配体的双核金(I)配合物(L = diNHC)。所获得的配合物在卡宾供体之间的桥接基团和咪唑-2-亚烷基环上的末端翼尖取代基上不同。通过元素分析,NMR光谱,ESI-MS光谱和单晶X射线结构分析对复合物进行了表征。双核金(I)配合物已在技术上相关的反应(如苯基硼酸与芳基溴化物之间的交叉偶联以及炔烃的分子间加氢胺化)中作为均相催化剂进行了测试。已对络合物Au 2 Br 2 L 1 – 9和基准单核络合物IPrAuCl的催化性能进行了比较。
N-sulfonylamidines. Part III. A new rearrangement reaction of N-alkylsulfonyl-amidines: Synthesis of enamines, β-aminosulfonyl-enamines and 4H-thiazete-S,S-dioxides.
作者:Francesca Clerici、Donato Pocar、Antonella Rozzi
DOI:10.1016/s0040-4020(01)96105-8
日期:1991.3
N-alkylsulfonylamidines (1) ( a newclass of amidines) rearrange by intramolecular attack of the carbanion generated α to the SO2 group on the amidine carbon. Through a cyclic thiazetidine intermediate three main classes of compounds are formed, i.e. enamines (), β-aminosulfonylenamines () and 4H-thiazete-S,S-dioxides (). In the rearrangement products and the two carbon moieties of the amidine formerly linked to
Tertiary Alcohols by Tandem β-Carbolithiation and N→C Aryl Migration in Enol Carbamates
作者:Anne M. Fournier、Jonathan Clayden
DOI:10.1021/ol2029355
日期:2012.1.6
Enolcarbamates (O-vinylcarbamates) derivedfrom aromatic or α,β-unsaturated compounds and bearing an N-aryl substituent undergo carbolithiation by nucleophilic attack at the (nominally nucleophilic) β position of the enol double bond. The resulting carbamate-stabilized allylic, propargylic, or benzylic organolithium rearranges with N→C migration of the N-aryl substituent, creating a quaternary carbon
Achieving Aliphatic Amine Addition to Arylalkynes via the Lewis Acid Assisted Triazole-Gold (TA-Au) Catalyst System
作者:Teng Jia、Shengyu Fan、Fengmian Li、Xiaohan Ye、Wenke Zhang、Zhiguang Song、Xiaodong Shi
DOI:10.1021/acs.orglett.1c02098
日期:2021.8.6
Transition metal catalyzed intermolecular hydroamination of the arylalkynes with aliphatic amine is generally problematic due to the good coordination between amine and metal cation. With the combination of 1,2,3-triazole coordinated gold(I) catalyst (TA-Au) and Zn(OTf)2 cocatalyst, this challenging transformation was achieved with good to excellent yields and regioselectivity. Compared to previously