作者:Hongwei Wang、Rapolu Kiran Kumar、Yang Yu、Lin Zhang、Zhaohong Liu、Peiqiu Liao、Xihe Bi
DOI:10.1002/asia.201601024
日期:2016.10.20
molecules. The isocyanide–isocyanide [3+2] cross‐cycloadditionreaction constitutes a straightforward method to access imidazoles starting from the easily available chemicals. So far, only three successive reports are known and all lead to the formation of 1,4‐disubstituted imidazoles. Here, we report the first isocyanide–isocyanide [3+2] cross‐cycloadditionreaction allowing for the formation of 1,4,5‐trisubstituted
“On Water”: Efficient Iron-Catalyzed Cycloaddition of Aziridines with Heterocumulenes
作者:Mani Sengoden、Tharmalingam Punniyamurthy
DOI:10.1002/anie.201207746
日期:2013.1.7
In suspension: The reaction of aziridines with heterocumulenes in the presence of Fe(NO3)3⋅9 H2O in aqueous suspension provides access to functionalized five‐membered heterocycles in good to high yields. This protocol has a wide substrate scope, is simple, and uses a nontoxic and cheap catalyst.
Dramatically Enhanced Solubility of Halide-Containing Organometallic Species in Diiodomethane: The Role of Solvent⋅⋅⋅Complex Halogen Bonding
作者:Mikhail A. Kinzhalov、Mariya V. Kashina、Alexander S. Mikherdov、Ekaterina A. Mozheeva、Alexander S. Novikov、Andrey S. Smirnov、Daniil M. Ivanov、Mariya A. Kryukova、Aleksandr Yu. Ivanov、Sergej N. Smirnov、Vadim Yu. Kukushkin、Konstantin V. Luzyanin
DOI:10.1002/anie.201807642
日期:2018.9.24
σ‐hole‐donating ability of this solvent, which results in the formation of uniquely strong solvent–(metal complex) halogen bonding. The strength of the halogen bonding is attenuated by the introduction of additional halogenatoms in the organometallic species owing to the competitive formation of more favourable intermolecular complex–complex halogen bonding. The exceptional solvation properties of diiodomethane
在当前的研究中,我们评估了许多有机金属物种的溶解度,并表明与其他卤代烷烃溶剂相比,二碘甲烷中的溶解度得到了显着提高。CH 2 I 2的更好的溶剂化性能与这种溶剂的σ空穴提供能力强得多有关,这导致形成独特的牢固的溶剂-(金属络合物)卤素键。由于竞争性形成了更有利的分子间配合物-配合物卤素键,竞争性形成了有机金属物种中引入的其他卤素原子,从而削弱了卤素键的强度。二碘甲烷的出色溶剂化特性及其对有机金属物种的惰性使该溶剂成为NMR研究(特别是不敏感自旋光谱的获取)的良好候选者。
Dual Activation of Nucleophiles and Electrophiles by N-Heterocyclic Carbene Organocatalysis: Chemoselective N-Imination of Indoles with Isocyanides
作者:Jungwon Kim、Soon Hyeok Hong
DOI:10.1021/acs.orglett.7b01377
日期:2017.6.16
first chemoselective N-imination of indoles with isocyanides by using an N-heterocyclic carbene (NHC) as an organocatalyst was achieved. A concurrent activation of nucleophile (indole) and electrophile (isocyanide) took place facilitated by the novel NHC organocatalysis via initial activation of isocyanide. The in situ generated indole anion and imine-azolium species performed a coupling reaction, producing