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
more hindered vinyl bromides, the use of the original bidentate chelator 8 was shown to be more efficient to promote the coupling reactions than our key tetradentate ligand 3. The corresponding N-(1-alkenyl)azoles and alkenyl aryl ethers are obtained in high yields and selectivities under very mild temperature conditions (35-110 degrees C for N-vinylation reactions and 50-80 degrees C for O-vinylation
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。
Pd/Al 2 O 3 -catalysed regioselective N -1-modification of benzotriazoles using iodonium salts
作者:Dmitry V. Davydov、Yurii F. Oprunenko、Irina P. Beletskaya
DOI:10.1016/j.tetlet.2017.10.033
日期:2017.11
The Pd/Al2O3-catalysed N-modification of symmetrically substituted benzotriazoles using diaryl-, alkenyl- and ethynyliodonium salts took place regioselectively at the N-1-position of the benzotriazole ring.
使用二芳基-,烯基-和乙炔基碘鎓盐的对称取代的苯并三唑的Pd / Al 2 O 3催化的N-修饰在苯并三唑环的N -1位区域选择性地发生。
A Moisture- and Air-Stable Cationic Ruthenium Complex as Catalyst for Highly Atom-Economical Stereo- and Regioselective Vinylation of Azoles
作者:Uttam Kumar Das、Manish Bhattacharjee
DOI:10.1002/chem.201103424
日期:2012.4.23
Vinylation of azoles: The cationic RuII complex, [RuCl(PPh3)(dppe)(CH3CN)2][BPh4], is an efficient catalyst for regio‐ and stereoselective vinylation of azoles by alkynes (dppe=diphenylphosphinoethane; see scheme). Only 0.5 mol % of the complex is required and the reactions do not require stringent exclusion of moisture and air.