catalytic activation of the leaving group in the S(N)2reaction is achieved as an extension of our mercuric triflate-catalyzed reactions. Derivatives of anilinoethyl 4-pentynoate reacted smoothly with catalytic amounts of Hg(OTf)(2) to give indoline derivatives in excellent yield with efficient catalytic turnovers under very mild conditions. The reaction of optically pure secondary alcohol derivatives
Synthesis, stereoelectronic characterization and antiparasitic activity of new 1-benzenesulfonyl-2-methyl-1,2,3,4-tetrahydroquinolines
作者:Romina J. Pagliero、Sabrina Lusvarghi、Adriana B. Pierini、Reto Brun、María R. Mazzieri
DOI:10.1016/j.bmc.2009.11.010
日期:2010.1
The synthesis and full 3D structural characterization of nine new 1-benzenesulfonyl-2-methyl-1,2,3,4-tetrahydroquinoline derivatives are reported. These belong to a library whose rationale for the design was the previous knowledge of the biological relevant properties of both structural moieties. From protozoan antiparasitic screening, compounds 3 demonstrated interesting activity against Trypanozoma
报道了九种新的1-苯磺酰基-2-甲基-1,2,3,4-四氢喹啉衍生物的合成和完整的3D结构表征。这些属于一个图书馆,该图书馆的设计依据是对这两个结构部分的生物学相关特性的先前了解。从原生动物的抗寄生虫筛选中,化合物3表现出对克鲁斯氏锥虫的有趣活性,且细胞毒性低。此外,大多数化合物对恶性疟原虫具有中等活性。其中3和9可被视为进一步优化的铅支架。BS上的取代基不影响3D结构性质,而11 H NMR光谱表明存在分子内弱氢键C–H⋯OS 。分子建模和X射线晶体学也证实了这一发现,这与化合物的构象偏爱有关。
The search for efficient molecular hydrogenprecursors and their catalytic exploration is necessary for the evolution of catalytic transfer hydrogenation. Methyl formate (MF) having high hydrogen content still remains unexplored for such transformations. Herein, we disclosed a bifunctional Ir(III)-complex catalyzed chemoselective TH protocol for N-heteroarenes and azoarenes using MF. A variety of substrates
Diboron-Assisted Palladium-Catalyzed Transfer Hydrogenation of <i>N</i>-Heteroaromatics with Water as Hydrogen Donor and Solvent
作者:Qingqing Xuan、Qiuling Song
DOI:10.1021/acs.orglett.6b01999
日期:2016.9.2
A Pd-catalyzed transfer hydrogenation of various N-heteroaromatic compounds with B(2)pin(2) as a mediator and environmentally benign water as both solvent and hydrogen donor has been disclosed. This reaction proceeded under ambient temperature with a broad range of N-heteroaromatic compounds among which imidazo [1,2-alpha]pyridine derivatives were for the first time selectively reduced to 5,6,7,8-tetrahydroimidazo[1,2-alpha]pyridines, which are the core structural motifs of an inhibitor of human O-GlcNAcase. Mechanistic studies suggested that the new protons products are from water and Pd-H might be the key intermediate with B(2)pin(2) as the H2O activator.