Nucleophilic Iron Complexes in Proton‐Transfer Catalysis: An Iron‐Catalyzed Dimroth Cyclocondensation
作者:Aslihan Baykal、Dihan Zhang、Jakob Knelles、Isabel T. Alt、Bernd Plietker
DOI:10.1002/asia.201900821
日期:2019.9.2
The nucleophilic ironcomplex Bu4 N[Fe(CO)3 (NO)] (TBA[Fe]) is an active catalyst in C-H-amination but also in proton-transfer catalysis. Herein, we describe the successful use of this complex as a proton-transfer catalyst in the cyclocondensation reaction between azides and ketones to the corresponding 1,2,3-triazoles. Cross-experiments indicate that the proton-transfer catalysis is significantly
亲核铁配合物Bu4 N [Fe(CO)3(NO)](TBA [Fe])在CH胺化反应中也是质子转移催化中的活性催化剂。在本文中,我们描述了该复合物作为质子转移催化剂在叠氮化物和酮与相应的1,2,3-三唑之间的环缩合反应中的成功应用。交叉实验表明,质子转移催化显着快于腈转移催化,这将导致生成CH胺化产物。给出了成功地将Dimroth三唑-二氢吲哚成功合成为相应的三唑取代的二氢吲哚的实例。
1H-azirines as intermediates in the photolysis of 1,2,3-triazoles
作者:Glynn Mitchell、Charles W. Rees
DOI:10.1039/c39860000399
日期:——
Photolytic conversion of 1-aryl-1,2,3-triazoles (5) and (14) into the ‘rearranged’ indoles (4) and (15), respectively, provides the first evidence for antiaromatic 1H-azirines, e.g.(8), as reactive intermediates in a photochemical reaction.
Cycloadduct formation of α,β-unsaturated esters with azides catalyzed by NHC systems
作者:Huijun Yuan、Hua Gao、Kun Liu、Zhantao Liu、Jian Wang、Wenjun Li
DOI:10.1039/c7ob02469j
日期:——
NHC-catalyzed cycloadduct formation of α,β-unsaturatedesters with azides has been developed. This strategy could generate 1,2,3-triazoles and dihydropyrazoles with high yields and regioselectivities in the presence of an N-heterocyclic carbene catalyst. The broad substrate scope and mechanistic survey of this process are also presented.
Novel self-condensation of 3-(azol-5-yl)-1,1-dimethylenamines has been found to form new C–C bonds leading to 2,4-(1,2,3-triazole-1,2,3-thiadiazole-3-phenylisothiazole)-(1E,3Z)-5-yl-butadiene-1-amines. The discovered reaction represents a new example of C–H functionalization in unsaturated systems and can serve an efficient synthetic approach to rational design of new 2,4-(diazole-5-yl)-dieneamines