Abstract A decarboxylative hydroamination cascade reaction of 3-arylpropiolic acids with N-heterocycles under transition-metal-free conditions was developed. 3-Arylpropiolic acids were found to react smoothly with a range of N-heterocycles under the effect of t-BuOK to afford N-vinyl heterocycles in moderate to excellent yields. This reaction represents the first decarboxylative hydroamination of 3-arylpropiolic
First Application of an Efficient and Versatile Ligand for Copper-Catalyzed Cross-Coupling Reactions of Vinyl Halides with <i>N</i>-Heterocycles and Phenols
作者:M. Shahjahan Kabir、Michael Lorenz、Ojas A. Namjoshi、James M. Cook
DOI:10.1021/ol9026446
日期:2010.2.5
2-Pyridin-2-yl-1H-benzoimidazole L3 is presented as a new, efficient, and versatile bidentate N-donor ligand suitable for the copper-catalyzed formation of vinyl C−N and C−O bonds. This inexpensive and easily prepared ligand facilitates copper-catalyzedcross-couplingreactions of alkenyl bromides and iodides with N-heterocycles and phenols to afford the desired cross-coupled products in good to excellent
2-Pyridin-2-yl-1H-benzoimidazole L3 是一种新型、高效、多功能的双齿 N 供体配体,适用于铜催化形成乙烯基 CN 和 CO 键。这种廉价且易于制备的配体促进了铜催化的烯基溴化物和碘化物与N-杂环和酚的交叉偶联反应,以良好至极好的收率提供所需的交叉偶联产物,并完全保留立体化学。这种方法特别值得注意,因为它的效率,即温和的反应条件、低催化剂负载、简单、多功能和优异的官能团耐受性。
Lewis Acid Catalyzed Addition of Pyrazoles to Alkynes: Selective Synthesis of Double and Single Addition Products
contrast to the selectivedoubleaddition, the corresponding singleaddition of aliphatic and aromatic terminal alkynes exclusively proceeded in the presence of a catalytic amount of silver nitrate. Internal alkynes also participated in the singleaddition reaction with the aid of silver triflate as a catalyst. The notable feature of this protocol is the utilization of an addition reaction being optimal
straightforward and atom-economical process for the synthesis of substituted nitrogen-containing alkenes. Herein we report a novel protocol that involves for the first time solvent-freeconditions (SolFC) and the use of an organic base, namely 2-tert-butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazaphosphorine (BEMP) to stereoselectively promote the process. The scope of this metal-free protocol
Transition-Metal-Free Synthesis of<i>N</i>-(1-Alkenyl)imidazoles by Potassium Phosphate-Promoted Addition Reaction of Alkynes to Imidazoles
作者:Linhua Lu、Hong Yan、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1002/asia.201301173
日期:2014.1
The additionreaction of alkynes to N‐heterocycles by simply heating in DMSO with potassium phosphate is reported. Good yields with high stereoselectivity could be achieved for a range of substrates. The scope is quite general for both amines and phenylacetylenes. In addition, internal alkynes and α‐bromostyrene were also examined in this reaction. This process is efficient and useful for the synthesis