Nucleophilic amination of methoxypyridines by a sodium hydride–iodide composite
作者:Jia Hao Pang、Atsushi Kaga、Shunsuke Chiba
DOI:10.1039/c8cc05979a
日期:——
A new protocol for nucleophilic amination of methoxypyridines and their derivatives was developed using sodium hydride (NaH) in the presence of lithium iodide (LiI). The method offers a concise access to various aminopyridines which are potentially of medicinal interest.
Base-Mediated Intermolecular sp<sup>2</sup> C−H Bond Arylation via Benzyne Intermediates
作者:Thanh Truong、Olafs Daugulis
DOI:10.1021/ja200184b
日期:2011.3.30
A transition-metal-free method for arylation of heterocycle and arene carbon-hydrogen bonds by aryl chlorides and fluorides has been developed. The reactions proceed via aryne intermediates and are highly regioselective with respect to the C-H bond coupling component.
Cobalt-catalyzed cross-couplings of nitrogen-containing heterocyclic phosphonium salts with arylmagnesium halides proceeded efficiently with the aid of cobalt(II) catalyst and copper(I) salt in tetrahydrofuran at ambient temperature, producing the desired 4-arylated pyridine, quinoline, and quinoxaline in modest to good yields.
钴催化的含氮杂环鏻盐与芳基卤化镁的交叉偶联在钴 (II) 催化剂和铜 (I) 盐的帮助下在四氢呋喃中在环境温度下有效进行,产生所需的 4-芳基化吡啶、喹啉和喹喔啉产量适中至良好。
Novel CDK inhibition profiles of structurally varied 1-aza-9-oxafluorenes
A series of 1-aza-9-oxafluorenes with functionally varied 3-substituents have been prepared from N-phenoxycarbonyl-4phenyl-1,4-dihydropyridines and p-benzoquinone and biologically evaluated as inhibitors of various cyclin-dependant kinases. The absence of a 3-hydrogen bond acceptor function leads to a complete loss of inhibitory activity. Differing hydrogen bond acceptor functions surprisingly cause significant shifts in the selectivity of inhibition profiles. (C) 2004 Elsevier Ltd. All rights reserved.