1,3,5-Trialkyl-hexahydro-1,3,5-triazines–N-methylenealkylamines equilibria. 1H NMR studies in solutions
摘要:
The behavior of 1,3,5-trialkyl-1,3,5-hexahydrotriazines (A) in a variety of solvents was investigated by H-1 NMR. A are stable for linear alkyls in deuterated solvents such as chloroform, benzene, acetone, dioxane, dimethylsulfoxide and acetonitrile. In case of branched alkyls, A are in equilibrium with N-methylenealkylamines (B). The A/B ratio depends on solvent, concentration of the sample and temperature. A react easily with methanol and lead to the formation of N-(methoxymethyl)amines (C), which are in equilibrium with B. Both the quantitative evaluation of A-B equilibrium in solutions as well as the formation of C in methanol was described for the first time. (C) 2008 Elsevier B.V. All rights reserved.
Synthesis, structure, and antitumor activity of 2,9-disubstituted perhydro 2,3a,7b,9,10a,14b-hexaazadibenzotetracenes
作者:Elena B. Rakhimova、Victor Yu. Kirsanov、Elena V. Tret'yakova、Leonard M. Khalilov、Askhat G. Ibragimov、Lilya U. Dzhemileva、Vladimir A. D'yakonov、Usein M. Dzhemilev
DOI:10.1039/d0ra03209c
日期:——
Catalytic methods for the synthesis of previously unknown 2,9-disubstituted 3bR*,7aR*,10bR*,14aR*-cis-14c,14d-perhydro-2,3a,7b,9,10a,14b-hexaazadibenzotetracenes with pronounced antitumor activity have been developed.
Triazacyclohexane chromium triflate complexes as precursors for the catalytic selective olefin trimerisation and its investigation by mass spectrometry
作者:Randolf D. Köhn、Alexander G.N. Coxon、Samaphon Chunawat、Callum Heron、Shahram Mihan、Catherine L. Lyall、Shaun B. Reeksting、Gabriele Kociok-Köhn
DOI:10.1016/j.poly.2020.114572
日期:2020.7
synthesised from R3TACCrCl3 in neat TfOH or by addition of R3TAC to Cr(OTf)3 or better Cr(OTf)3(THF)3, the synthesis and structure of which is presented here. The use of this highly defined system allowed the identification of 2-methyl-1-hexene as a side product of activation with AlMe3, in agreement with the proposed metallacyclic mechanism. Isomer distribution of the trimer product is similar to R3TACCrCl3/MAO
Preparation and Reactions of<i>N</i>-Alkyl(Aryl),<i>N</i>-Isothiocyanatomethyl Carboxamides. Synthesis of 1,3,5-Thiadiazepin-6-ones
作者:András Vass、Gábor Szalontai
DOI:10.1055/s-1986-31789
日期:——
N-Alkyl(aryl),N-isothiocyanato carboxamides 3 are prepared by the reaction of the corresponding 2-chloroacetamides 1 with potassium thiocyanate. In the case of N-aryl substitution the intermediate thiocyanates 2 could be isolated. These thiocyanates isomerize to isothiocyanates 3 at different rates depending on aryl substituents, temperature and solvents. The reaction between 3k and a nucleophilic agent (e.g. methanol, isopropylthiol, sodium hydrogensulfide, or ethyl malonate) results in the corresponding 1,3,5-thiadiazepin-6-ones, 5 by ring closure.
Complex Formation of Calcium Bis(tetraethylaluminate) with N‐Donor Ligands
作者:Matthias Hülsmann、Beate Neumann、Hans‐Georg Stammler、Norbert W. Mitzel
DOI:10.1002/ejic.201200453
日期:2012.9
Treatment of calciumbis(tetraethylaluminate) with the bidentate N-donor ligands tetramethylmethylenediamine (L = TMMDA), tetramethylethylenediamine (L = TMEDA) and N,N′-dimethylpiperazine (L = DMP) and the tridentate N-donor ligands 1,3,5-trialkyl-1,3,5-triazacyclohexane L = cyclo-[N(R)CH2]3, R = Me (TMTAC), Cy (TCyTAC), tBu (TtBuTAC)} resulted in the formation of complexes of the formulae [Ca(AlEt4)2L]
用双齿 N-供体配体四甲基亚甲基二胺 (L = TMMDA)、四甲基乙二胺 (L = TMEDA) 和 N,N'-二甲基哌嗪 (L = DMP) 和三齿 N-供体配体 1,3 处理双(四乙基铝酸)钙, 5-三烷基-1,3,5-三氮杂环己烷L = 环-[N(R)CH2]3, R = Me (TMTAC), Cy (TCyTAC), tBu (TtBuTAC)} 导致形成复合物公式 [Ca(AlEt4)2L]。这些化合物通过核磁共振光谱和元素分析进行表征。从 TMMDA、DMP、TCyTAC 和 TMTAC 复合物获得适用于 X 射线衍射实验的单晶。在 TMTAC 的情况下,复合物结晶时有两个 TMTAC 配体与 Ca 原子结合,[Ca(AlEt4)2(TMTAC)2],但在溶液中,只有一个 TMTAC 配体与 Ca 原子结合。不同温度下的 NMR 光谱显示四乙基铝酸盐单元在这些化合物中
<i>Tetra</i>-Substituted Pyridinylimidazoles As Dual Inhibitors of p38α Mitogen-Activated Protein Kinase and c-Jun <i>N</i>-Terminal Kinase 3 for Potential Treatment of Neurodegenerative Diseases
作者:Felix Muth、Marcel Günther、Silke M. Bauer、Eva Döring、Sabine Fischer、Julia Maier、Peter Drückes、Jürgen Köppler、Jörg Trappe、Ulrich Rothbauer、Pierre Koch、Stefan A. Laufer
DOI:10.1021/jm501557a
日期:2015.1.8
Tetra-substituted imidazoles were designed as dualinhibitors of c-JunN-terminalkinase (JNK) 3 and p38αmitogen-activatedprotein (MAP) kinase. A library of 45 derivatives was prepared and evaluated in a kinase activity assay for their ability to inhibit both kinases, JNK3 and p38α MAP kinase. Dualinhibitors with IC50 values down to the low double-digit nanomolar range at both enzymes were identified