Exogenous-oxidant- and catalyst-free electrochemical deoxygenative C2 sulfonylation of quinoline <i>N</i>-oxides
作者:Minbao Jiang、Yong Yuan、Tao Wang、Yunkui Xiong、Jun Li、Huijiao Guo、Aiwen Lei
DOI:10.1039/c9cc07777d
日期:——
An exogenous-oxidant- and catalyst-free electrochemical deoxygenative C2 sulfonylation reaction has been achieved. By employing quinoline N-oxides as the starting materials, the electrochemical C–H sulfonylation of electron-deficient quinolines was indirectly achieved at room temperature and a variety of sulfonylated quinoline derivatives were synthesized in modest to high yield with excellent regioselectivity
Substituted and bridged tetrahydropyridines useful as calcium entry
申请人:Merck & Co., Inc.
公开号:US04579851A1
公开(公告)日:1986-04-01
Substituted dihydropyridines and substituted and bridged tetrahydropyridines are disclosed which are useful as calcium entry blockers.
披露了作为钙通道阻滞剂有用的取代二氢吡啶和取代和桥联四氢吡啶。
Intramolecular Diels-Alder reactions of quaternary pyrazinium salts and protonated pyrazinium cations. Synthesis of annelated pyridinium salts and annelated pyridines.
作者:Bart Geurtsen、Dick A. de Bie、Henk C. van der Plas
DOI:10.1016/s0040-4020(01)89528-4
日期:1989.1
quaternary pyrazinium salts as well as the protonated pyrazines undergo an intramolecular Diels-Alder reaction under considerably milder conditions than the corresponding neutral pyrazines. The products of the reactions were []-annelated quaternary pyridinium salts and []-annelated protonated pyridiniumcations, respectively.
如13 C NMR数据所示,炔基取代的吡嗪在二氯甲烷中用四氟硼酸三乙基氧鎓进行季铵化仅在N-4处产生3-炔基-1-乙基吡嗪鎓盐。同样的吡嗪与三氟乙酸的质子化也发生在N-4处。季吡嗪鎓盐以及质子化的吡嗪在比相应的中性吡嗪温和得多的条件下进行分子内Diels-Alder反应。反应产物分别为[ ]-退火的季吡啶鎓盐和[ ]-退火的质子化吡啶鎓阳离子。
Synthese d'imines cycliques non-stabilisees par reactions gaz-solide sous vide et thermolyse-eclair (1,2)