我们报告了氯-1 H -1,2,3-三唑盐与脂肪族胺的氟化物介导的亲核芳香胺化。该反应在温和的反应条件下进行,得到具有多种官能团的氨基-1,2,3-三唑鎓盐,可用于进一步的转化。此外,发现氨基-1,2,3-三唑鎓盐通过去质子化转化为N-杂环亚胺(NHI),对苯乙酮与三甲基甲硅烷基氰化物的氰基化反应表现出优异的催化活性。
Nucleophilic substitution of 4-bromomethyltriazolium with different nucleophiles
作者:Xingyu Xu、Linfeng Li、Zengyu Zhang、Xiaoyu Yan
DOI:10.1016/j.tet.2018.10.009
日期:2018.11
1,2,3-Triazolium salts draw much attentions in recent years. We developed a new synthetic method to heteroatom-functionalized triazoliums via nucleophilicsubstitution of 4-bromomethyltriazolium. This method afforded triazoliums with different S, N, and O heteroatom-substituents. Moreover, SN2′ reaction was observed with alcohols or hydroxides. In addition, debromination and debromomethylation reaction
近年来,1,2,3-三唑鎓盐备受关注。我们开发了一种新的合成方法,用于通过4-溴甲基三唑的亲核取代作用来杂原子官能化的三唑。该方法提供了具有不同S,N和O杂原子取代基的三唑鎓。此外,观察到与醇或氢氧化物的S N 2'反应。另外,在某些情况下发生脱溴和脱溴甲基化反应。
An allenylidene Au(i) catalyst based on triazolylidene moieties, featuring the high σ-donating ability (comparable to that of other NHC ligands) and largely enhanced π-accepting ability of its ligand, was developed for the first time. As compared with the extant gold complexes such as IPrAuCl, Ph3PAuCl and (PhO)3PAuCl, these allenylidene Au(i) catalysts exhibited superior catalytic activities in the
Synthesis of Mesoionic N-Heterocyclic Olefins and Catalytic Application for Hydroboration Reactions
作者:Zengyu Zhang、Shiqing Huang、Linwei Huang、Xingyu Xu、Hongyan Zhao、Xiaoyu Yan
DOI:10.1021/acs.joc.0c00257
日期:2020.10.2
Mesoionic N-heterocyclic olefins have been developed, which feature high ylidic character. These compounds have been used as efficient catalysts for hydroboration of imines, nitriles, and N-heteroarenes.
Mesoionic Carbene (MIC)-Catalyzed H/D Exchange at Formyl Groups
作者:Wei Liu、Liang-Liang Zhao、Mohand Melaimi、Lei Cao、Xingyu Xu、Jean Bouffard、Guy Bertrand、Xiaoyu Yan
DOI:10.1016/j.chempr.2019.08.011
日期:2019.9
exchange at formyl groups is the most direct approach for the synthesis of deuterated aldehydes. Platinum-group metal complexes have been employed to catalyze this transformation, with significant substrate scope limitations. Although N-heterocyclic carbenes can also activate the C–Hbond of aldehydes through the formation of Breslow intermediates, benzoin condensation and other C–C-bond-forming pathways