The fragmentation of 5- and 3-substituted thiophene-2-carboxamides under electron impact
摘要:
AbstractThe 70 eV electron impact mass spectra of twelve 5‐ and 3‐substituted thiophene‐2‐carboxamides are discussed with the aid of exact mass measurements and labelling experiments. All mass spectra exhibit pronounced molecular ions. Some isomeric 5‐ and 3‐substituted title compounds can be differentiated by mass spectrometry. The fragmentation is influenced by a strong ‘ortho‐effect’ which activates the NH3 elimination. In the other cases the most important fragmentation is NH2˙ loss, followed by CO elimination.
A New Route to the Synthesis of Bicyclo [3.3.2] Nonene by Radical Cyclisation
作者:Jean-Marc Duffault、Frédérique Tellier
DOI:10.1080/00397919808004298
日期:1998.7
Abstract Radical-induced cyclisation to form 7-membered ring with bicyclic framework was achieved by tributyltin hydride (TBTH) and α, α'-azobis-(isobutyronitrile) (AIBN).
Forming Benzylic Iodides via a Nickel Catalyzed Diastereoselective Dearomative Carboiodination Reaction of Indoles
作者:Austin D. Marchese、Florian Lind、Áine E. Mahon、Hyung Yoon、Mark Lautens
DOI:10.1002/anie.201900659
日期:2019.4
A diastereoselective dearomative carboiodination reaction is reported. We report a novel metal‐catalyzed approach to install reactive secondary benzylic iodides. Utilizing the unique reactivity of nickel, we have expanded the carboiodination reaction to non‐activated aromatic double bonds forming a previously unattainable class of iodides. We also report a broadly applicable method to avoid the use
Synthesis of 1,2,3-Fused Indole Polyheterocycles by Copper-Catalyzed Cascade Reaction
作者:Veerababurao Kavala、Zonghan Yang、Ashok Konala、Tang-Hao Yang、Chun-Wei Kuo、Jian-Yao Ruan、Ching-Fa Yao
DOI:10.1002/ejoc.201701618
日期:2018.3.14
A copper‐catalyzed cascade reaction between 2‐iodobenzamide and 2‐iodobenzyl cyanide has been developed. The one‐pot protocol provides access to a wide range of 1,2,3‐fused indole polyheterocycles in good yields within a short period of time.
The present invention relates to compounds according to formula (1), a method for producing these compounds and electronic devices, in particular organic electroluminescent devices containing said compounds.
Palladium-Catalyzed Asymmetric Dearomative Carbonylation of Indoles
作者:Qiuyu Li、Yunchu Zhang、Yuye Zeng、Yujing Fan、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.2c00962
日期:2022.4.29
we disclose a strategy for the asymmetric dearomatization of N-arylacyl indoles via a palladium-catalyzed tandem Heck/carbonylation, leading to an array of indoline-3-carboxylates bearing vicinal C2-aza-quaternary and C3 tertiary stereocenters in high yields and excellent enantio- and diastereoselectivities. This study is an important advance in the field of asymmetric carbonylation and enantioselective