Observations on the intramolecular Heck reactions of aromatic chlorides using palladium/imidazolium salts
作者:Stephen Caddick、William Kofie
DOI:10.1016/s0040-4039(02)02340-7
日期:2002.12
The intramolecular Heck reaction of aromatic amines and ethers using palladium/imidazoliumsalts is described. The use of tetra-n-butylammonium halide salts facilitates the reactivity of aromatic chlorides. An unexpected and novel palladium-mediated cyclisation is also described leading to the formation of a tricyclic adduct.
One-pot strategy of copper-catalyzed synthesis of 1,2-disubstituted benzimidazoles
作者:Caixia Xie、Xushuang Han、Jian Gong、Danyang Li、Chen Ma
DOI:10.1039/c7ob00945c
日期:——
A simple, one-pot and copper-catalyzed coupling reaction for the construction of 1,2-disubstituted benzimidazole derivatives is described. Low-cost copper salt and weak base K3PO4 were utlized in this reaction. A variety of 1,2-disubstituted benzimidazoles were obtained in moderate to excellent yields.
A computationally designed titanium-mediated amination of allylic alcohols for the synthesis of secondary allylamines
作者:Zunming Sun、Qingxia Wang、Yi Xu、Zhihong Wang
DOI:10.1039/c5ra18503c
日期:——
A computational design was inspired by previous mechanistic studies and the DFT-guided reactions were implemented in the synthesis of secondary allylamines. The participation of titanium imido intermediates facilitated the reaction and the closed transition states in the bond-forming steps rendered exclusive SN2′ substitution products.
以前的机理研究启发了计算设计,并且在仲烯丙胺的合成中实施了DFT指导的反应。钛亚氨基中间体的参与促进了反应,并且在键形成步骤中的闭合过渡态提供了唯一的S N 2'取代产物。
Radical relay cyclization/C–C bond formation of allyloxy-tethered aryl iodides with quinoxalin-2(1<i>H</i>)-ones <i>via</i> polysulfide anion photocatalysis
作者:Zhongyi Zhang、Yaqin Zhou、Jiehui Wang、Yicheng Zhang、Lei Wang、Jie Liu、Chao Zhou、Min Wang、Pinhua Li
DOI:10.1039/d3ob01978k
日期:——
A visible-light-induced radical relay cyclization/C–C bondformation of quinoxalin-2(1H)-ones with allyloxy-tethered aryl iodides using polysulfide anions as a photocatalyst is described. This protocol allows efficient access to a variety of complicated molecules bearing both quinoxalin-2(1H)-one and 2,3-dihydrobenzofuran motifs in high yields under mild reaction conditions with a broad range of substrates
描述了使用多硫阴离子作为光催化剂,可见光诱导的喹喔啉-2( 1H )-酮与烯丙氧基系芳基碘化物的自由基中继环化/C-C键形成。该协议允许在温和的反应条件下使用多种底物以高产率有效获取带有喹喔啉-2(1 H )-一和2,3-二氢苯并呋喃基序的各种复杂分子。