Lewis Acid Activation of Pyridines for Nucleophilic Aromatic Substitution and Conjugate Addition
作者:Sarah Abou-Shehada、Matthew C. Teasdale、Steven D. Bull、Charles E. Wade、Jonathan M. J. Williams
DOI:10.1002/cssc.201403154
日期:2015.3
clean, mild and sustainable method for the functionalization of pyridines and their analogues is reported. A zinc‐based Lewis acid is used to activate pyridine and its analogues towards nucleophilic aromatic substitution, conjugate addition, and cyclization reactions by binding to the nitrogen on the pyridine ring and activating the pyridine ring core towards further functionalization.
Aza-Michael-type addition reaction catalysed by a supported ionic liquid phase incorporating an anionic heteropoly acid
作者:Mohammad Hadi Ghasemi、Elaheh Kowsari、Abbas Shafiee
DOI:10.1016/j.tetlet.2016.01.107
日期:2016.3
yields using the Aza-Michael-type addition of various amines to vinyl compounds catalysed by a supported ionic liquid incorporating an anionic heteropoly acid. Different catalysts, including Lewisacids, Brønsted acids and heteropoly acids were investigated in which heteropoly acids having dual Brønsted and Lewisacid characteristics were excellent catalysts. The ionic liquid incorporating a polytungstate
The compounds are 3-morpholino-2-heterocyclicthiopropanamides which are inhibitors of gastric acid secretion.
这些化合物是3-吗啉基-2-杂环硫代丙酰胺,它们是胃酸分泌抑制剂。
Exploring the acidic catalytic role of differently structured deep eutectic solvents in the aza-Michael addition of amines to 2-vinylpiridine
作者:Marco Ballarotto、Federico Cappellini、Riccardo Maestri、Tiziana Del Giacco、Pietro Di Profio、Matteo Tiecco、Raimondo Germani
DOI:10.1007/s00706-020-02660-z
日期:2020.9
chemistry. Deep Eutectic Solvents (DESs) are currently gaining relevance in this field thanks to their unique properties in terms of their “greenness” as well as in terms of their catalytic properties. In this work we developed an efficient protocol for the conjugate aza-Michael addition of amines to 2-vinylpyridine using 14 differently structured acid DESs as both reaction media and catalysts, so preventing
Kurzmitteilungen. One-Flask Pyridylethylation of Amines by 2-(2-Pyridyl)-ethanolEinstufige Pyridylethylierung von Aminen mit 2-(2-Pyridyl)ethanol
作者:Ivo C. Ivanov、Stoyan K. Karagiosov、Piroshka B. Sulay
DOI:10.1002/ardp.19893220313
日期:——
The known methods for pyridylethylation of primary and secondary amines make use of 2‐(2‐halogenoethyl)‐pyridine or 2‐vinylpyridine as alkylating agents. The reaction of 2‐vinylpyridine, which is catalyzed by protic acids, is carried out with the hydrochlorides or acetates of the amines in alkoholic or aqueous media. Although the yields are thus good enough, the use of 2‐vinylpyridine has some disadvantages