The role of ion/neutral complexes in the fragmentation of N-benzyl-(alkylpyridinium) ions
作者:Dietmar Kuck、Hans-Friedrich Grützmacher、Dieter Barth、Sandra Heitkamp、Matthias C. Letzel
DOI:10.1016/j.ijms.2010.10.006
日期:2011.9
potential benzylic hydride donor sites present in the ortho- , meta- and para- alkyl groups (R = methyl, ethyl, isopropyl and benzyl). Collision-induced dissociation of the ions, carried out in an electrical ion cage mass spectrometer, revealed that hydride transfer strongly depends both on the energy requirements of the hydride transfer but also on the position of the hydride donor. Hydride transfer, giving
Syntheses, Weak Interactions, and Crystal Structures of Two Tetrabromocuprate(II) Complexes Containing Benzyl Substituted Alkyl Pyridinium
作者:Hui-Qing Ye、Yi-Yuan Li、Xu-Xian Wu、Xiao-Jue Wang、Jia-Rong Zhou、Xiao-Ping Liu、Le-Min Yang、Chun-Lin Ni
DOI:10.1080/15533174.2013.790058
日期:2014.7.3
Two tetrabromocuprate(II) complexes containing substituted benzyl alkyl pyridinium, [Bz-4-MePy](2)[CuBr4] (1) and [Bz-4-EtPy](2)[CuBr4] (2) ([Bz-4MePy](+) = (1-benzyl-4 '-methylpyridinium) [Bz-4-EtPy](+) = 1-benzyl-4 '-ethylpyridinium), were crystallized from methanol and dilute HBr solutions, and were determined by single crystal X-ray diffraction. Two complexes crystallize in the orthorhombic system with space group Pna2(1), and comprise two tortuous cations and one tetrahedral [CuBr4](2-) anion. The [CuBr4](2-) anions in two complexes form a linear chain by Br center dot center dot center dot Br interaction with the distance of 4.001 angstrom for 1 and 4.062 angstrom for 2, while the combination of C-H center dot center dot center dot Br and C-H center dot center dot center dot N weak hydrogen bonds, p center dot center dot center dot pi and pi center dot center dot center dot pi, interactions consolidate the crystal packing and results in a 3D network structure.
US4038082A
申请人:——
公开号:US4038082A
公开(公告)日:1977-07-26
Efficient and Chemoselective Reduction of Pyridines to Tetrahydropyridines and Piperidines<i>via</i>Rhodium-Catalyzed Transfer Hydrogenation
[Cp*RhCl2]2, catalyzes efficiently the transferhydrogenation of various quaternary pyridinium salts under mild conditions, affording not only piperidines but also 1,2,3,6‐tetrahydropyridines in a highly chemoselective fashion, depending on the substitution pattern at the pyridinium ring. The reduction is conducted in azeotropic formic acid/triethylamine (HCOOH‐Et3N) mixture at 40 °C, with catalyst loadings
Potent and Selective Tetrahydroisoquinoline Kappa Opioid Receptor Antagonists of Lead Compound (3<i>R</i>)-7-Hydroxy-<i>N</i>-[(1<i>S</i>)-2-methyl-1-(piperidin-1-ylmethyl)propyl]-1,2,3,4-tetrahydroisoquinoline-3-carboxamide (PDTic)
作者:Pauline W. Ondachi、Chad M. Kormos、Scott P. Runyon、James B. Thomas、S. Wayne Mascarella、Ann M. Decker、Hernán A. Navarro、Timothy R. Fennell、Rodney W. Snyder、F. Ivy Carroll
DOI:10.1021/acs.jmedchem.8b00673
日期:2018.9.13
dine-1-yl)methyl]propyl}-1,2,3,4-tetrahydroisoquinoline-3-carboxamide (12) (4-Me-PDTic). Compound 12 had a Ke = 0.37 nM in a [35S]GTPγS binding assay and was 645- and >8100-fold selective for the κ relative to the μ and δ opioid receptors, respectively. Calculated log BB and CNS (centralnervoussystem) multiparameter optimization (MPO) and low molecular weight values all predict that 12 will penetrate