A method for the synthesis of amide‐containing molecules was developed using vinylazides as an enamine‐type nucleophile towards carbon electrophiles, such as imines, aldehydes, and carbocations that were generated from alcohols in the presence of BF3⋅OEt2. After nucleophilic attack of the vinylazide, a substituent of the resulting iminodiazonium ion intermediate migrates to form a nitrilium ion,
Construction of 1-pyrroline skeletons by Lewis acid-mediated conjugate addition of vinyl azides
作者:Xu Zhu、Shunsuke Chiba
DOI:10.1039/c5cc10299e
日期:——
The Lewis acid-mediated conjugate addition of vinyl azides to electron-deficient alkenes led to the efficient construction of 1-pyrroline skeletons.
Lewis酸介导的乙烯基叠氮化物与电子亏缺烯烃的共轭加成,有效地构建了1-吡咯烯骨架。
Electrocatalytic Synthesis of gem-Bisarylthio Enamines and α-Phenylthio Ketones via a Radical Process under Mild Conditions
作者:Xiu-Jin Meng、Zu-Yu Mo、Yong-Zhou Pan、Shi-Yan Cheng、Qian-Yu Li、Hai-Tao Tang、Ying-Ming Pan
DOI:10.1055/a-1335-7902
日期:2021.4
The novel method for the synthesis of gem-bisarylthio enamines and α-phenylthio ketones was developed via the coupling of α-substituted vinyl azides with thiols in the presence of tetrabutylammonium iodide (TBAI) as a redox catalyst and electrolyte at room temperature. Electronic properties were crucial in the generated products. This protocol features metal- and oxidant-free materials, broad tolerance
Copper(I) iodide-catalyzed oxidative C(sp2)–H functionalization of pyridines and isoquinolines for the synthesis of imidazo[1,2-a]pyridines and 2-phenylimidazo[2,1-a]isoquinolines with vinyl azides under mild aerobic conditions is reported. Good selectivity for 3-substitutedpyridines and single isomer formation with isoquinolines were observed.
碘化铜(I)催化吡啶和异喹啉的碘化铜(I 2)催化氧化C(sp 2)–H官能团,用于在温和的条件下用乙烯基叠氮化物合成咪唑并[1,2- a ]吡啶和2-苯基咪唑并[ 2,1- a ]异喹啉有氧条件的报道。观察到对3-取代的吡啶具有良好的选择性,并与异喹啉形成了单一异构体。
Formal [4+2]-Annulation of Vinyl Azides with N-Unsaturated Aldimines
functionalized quinolines and pyridines could be synthesized by BF3⋅OEt2‐mediated reactions of vinylazides with N‐aryl and N‐alkenyl aldimines, respectively. The reaction mechanism could be characterized as formal [4+2]‐annulation, including unprecedented enamine‐type nucleophilic attack of vinylazides to aldimines and subsequent nucleophilic cyclization onto the resulting iminodiazonium ion moieties.