Efficient Routes for the Synthesis of Novel Bis(<i>s</i>-triazolo[3,4-<i>b</i>][1,3,4]thiadiazines)
作者:Radwan M. Sarhan、Mohamed A. Badawy、Ahmed H. M. Elwahy
DOI:10.1002/jhet.1854
日期:2014.8
Bis(triazolo[3,4-b]thiadiazine) in which the fused system is linked directly to the benzene core can be synthesized in 75% yield by, firstly, preparation of bis(s-triazole) followed by reaction with phenacyl bromide in refluxing EtOH/DMF mixture containing piperidine. Bis(s-triazolo[3,4-b][1,3,4]thiadiazines) and in which the triazolothiadiazines are linked to benzene core via alkyl or ether linkage
双(三唑并[3,4- b ]噻二嗪)通过首先制备双(s-三唑),可以75%的产率合成其中稠合体系直接与苯核相连的体系。 然后与 苯甲酰溴 在回流的含哌啶的EtOH / DMF混合物中。Bis(s -triazolo [3,4- b ] [1,3,4]噻二嗪) 和 其中三唑并噻二嗪通过烷基或醚键与苯核连接,分别从二羧酸开始以70%和72%的产率合成 和 用两摩尔的 硫代碳酰肼 得到相应的双(4-氨基-5-巯基-s -triazolo-3-y1)衍生物 和 然后与两当量的苯甲酰溴反应。双(6-苯基-7 H- [1,2,4]三唑[3,4- b ] [1,3,4]噻二嗪)通过硫代亚甲基亚基间隔基连接到芳烃核上,是通过 4-氨基-4 H -1,2,4-三唑-3,5-二硫醇 与适当的双(溴甲基)苯 得到双(4-氨基-5-巯基-4 H -3-硫烷基甲基)芳烃以及随后与苯甲酰溴的反应。化合物 可以通过两次取代获得60-70%的收率
Facile esterification of carboxylic acid using amide functionalized benzimidazolium dicationic ionic liquids
作者:Prashant Narayan Muskawar、K. Thenmozhi、Jayant M. Gajbhiye、Pundlik Rambhau Bhagat
DOI:10.1016/j.apcata.2014.06.004
日期:2014.7
of carboxylicacids with alkyl/allyl/aryl halides in presence of triethylamine. The amide groups present in this new series of DBimILs are expected to form hydrogen bonding with the carboxylicacids and this could facilitate the esterification reactions under mild conditions devoid of any added catalyst or organic solvent. The plausible mechanism for the enhanced catalytic activity in presence of this
Serotonin Dimers: Application of the Bivalent Ligand Approach to the Design of New Potent and Selective 5-HT<sub>1B/1D</sub> Agonists
作者:Serge Halazy、Michel Perez、Catherine Fourrier、Isabelle Pallard、Petrus J. Pauwels、Christiane Palmier、Gareth W. John、Jean-Pierre Valentin、Régine Bonnafous、Jean Martinez
DOI:10.1021/jm960552l
日期:1996.1.1
formation mediated by the human 5-HT(1B) receptor (formerly the 5-HT(1Dbeta) receptor) demonstrate that all of these serotonin dimers behave as full agonists. Among them, the piperazide derivatives of bis-serotonin, 4g,j, were also identified as very potent agonists in contracting the New Zealand white rabbit saphenous vein (pD2 = 7.6 in each case compared to 5.8 for sumatriptan). Results analysis supports
Synthesis and physiochemical properties of novel gemini surfactants with phenyl-1,4-bis(carbamoylmethyl) spacer
作者:Liyan Wang、Yue Zhang、Limin Ding、Jia Liu、Bing Zhao、Qigang Deng、Tie Yan
DOI:10.1039/c5ra13616d
日期:——
A series of novel gemini surfactants, namely, phenyl-1,4-bis[(carbamoylmethyl) N,N-(dimethylalkyl ammonium chloride)] (a, b and c), was synthesized systematically and characterized by FTIR, 1H NMR, 13C NMR and MS.
Positional Isomerism and Steric Effects in the Self-Assemblies of Phenylene Bis-Monothiooxalamides
作者:Eric G. Ramírez-Milanés、Francisco J. Martínez-Martínez、Nancy E. Magaña-Vergara、Susana Rojas-Lima、Yareth A. Avendaño-Jiménez、Efrén V. García-Báez、Luis M. Morín-Sánchez、Itzia I. Padilla-Martínez
DOI:10.1021/acs.cgd.7b00041
日期:2017.5.3
through strong NCOH···O intermolecular hydrogen bonds and promotes the formation of meso-helices. The steric demand of the thioamide NR group rules the conformation adopted by meta-substituted derivatives and the self-association arrangement of para-substituted derivatives. Infrared data support the blue-shifted nature of the NCSH···O hydrogen bond. NMR data in solution agree with the extensive intramolecular