Synthesis and antimicrobial activity of N1-benzyl or N1-benzyloxy-1,6-dihydro-1,3,5-triazine-2,4-diamines
摘要:
The emergence and spread of multidrug-resistant strains of Staphylococcus aureus and Mycobacterium tuberculosis are generating a threat to public health worldwide. In the current study, a series of N-1-benzyl and N-1-benzyloxy-1,6-dihydro-1,3,5-triazine-2,4-diamine derivatives were synthesized and investigated for their antimicrobial activity against S. aureus, and Mycobacterium smegmatis which is taxonomically related to M. tuberculosis. Most of the compounds exhibited good activity against M. smegmatis as determined by comparison of diameters of the zone of inhibition of test compounds and standard antibiotics. Compound 7o showed potent antimycobacterial activity against M. smegmatis without mammalian DHFR inhibition liability. The results from this study indicate that 1-benzyl derivatives of 1,6-dihydro-1,3,5-triazine-2,4-diamines may be used as lead compounds for the discovery of antimycobacterial agents. (C) 2011 Elsevier Ltd. All rights reserved.
Cyclic (Alkyl)(amino)carbene Ligand-Promoted Nitro Deoxygenative Hydroboration with Chromium Catalysis: Scope, Mechanism, and Applications
作者:Lixing Zhao、Chenyang Hu、Xuefeng Cong、Gongda Deng、Liu Leo Liu、Meiming Luo、Xiaoming Zeng
DOI:10.1021/jacs.0c12318
日期:2021.1.27
Transition metal catalysis that utilizes N-heterocycliccarbenes as noninnocent ligands in promoting transformations has not been well studied. We report here a cyclic (alkyl)(amino)carbene (CAAC) ligand-promoted nitro deoxygenative hydroboration with cost-effective chromium catalysis. Using 1 mol % of CAAC-Cr precatalyst, the addition of HBpin to nitro scaffolds leads to deoxygenation, allowing for
Deoxygenative hydroboration of primary, secondary, and tertiary amides: Catalyst‐free synthesis of various substituted amines
作者:Jaeeun Yi、Hyun Tae Kim、Ashok Kumar Jaladi、Duk Keun An
DOI:10.1002/bkcs.12438
日期:2022.1
less reactive functional groups under catalyst-free conditions is an interesting aspect and requires a typical protocol. Herein, we report the synthesis of various primary, secondary, and tertiary amines through hydroboration of amides using pinacolborane under catalyst-free and solvent-freeconditions. The deoxygenative hydroboration of primary and secondary amides proceeded with excellent conversions
Primary amides to amines or nitriles: a dual role by a single catalyst
作者:Hari S. Das、Shyamal Das、Kartick Dey、Bhagat Singh、Rahul K. Haridasan、Arpan Das、Jasimuddin Ahmed、Swadhin K. Mandal
DOI:10.1039/c9cc05856g
日期:——
of various primary amides to amines (25 examples). On simple modification of the reaction conditions such as in the presence of a catalytic amount of secondary amide, the same catalyst can transform the primary amides into intermediate nitrile compounds (16 examples) in excellent yields. This is the first example where such a controlled catalytic transformation of primary amides to amines or nitriles
An imidazolin-2-iminato ligand organozinc complex as a catalyst for hydroboration of organic nitriles
作者:Suman Das、Jayeeta Bhattacharjee、Tarun K. Panda
DOI:10.1039/c9nj04076e
日期:——
The reaction of diethylzinc with imidazolin-2-imines (ImRNH, R = Dipp (2,6-diisopropylphenyl)), Mes (2,4,6-trimethylphenyl), and tBu (tert-butyl) afforded the corresponding dimeric zinc(II) imidazolin-2-iminato complexes [(ImRN)Zn(CH2CH3)}2] (R = Dipp, 1a; R = Mes, 1b; R = tBu, 1c). The zinc complexes were characterised using spectroscopic techniques and the molecular structure of complex 1b was established
二乙基锌与咪唑啉-2-亚胺(Im R NH,R = Dipp(2,6-二异丙基苯基)),Mes(2,4,6-三甲基苯基)和t Bu(叔丁基)的反应得到相应的二聚体锌(II)咪唑啉-2-亚氨基配合物[(Im R N)Zn(CH 2 CH 3)} 2 ](R = Dipp,1a ; R = Mes,1b ; R = t Bu,1c)。锌配合物用光谱技术表征,配合物1b的分子结构通过单晶X射线衍射分析确定。复杂1c将其用作在环境温度下与频哪醇硼烷(HBpin)进行有机腈化学选择性加氢硼化的催化剂,以高收率获得具有广泛底物范围的二硼胺。锌配合物1c对催化硼氢化反应具有广泛的底物范围和良好的官能团耐受性。在动力学研究的基础上提出了一个最合理的机制。
Cobalt-Catalyzed and Lewis Acid-Assisted Nitrile Hydrogenation to Primary Amines: A Combined Effort
作者:Kenan Tokmic、Bailey J. Jackson、Andrea Salazar、Toby J. Woods、Alison R. Fout
DOI:10.1021/jacs.7b07368
日期:2017.9.27
The selective hydrogenation of nitriles to primary amines using a bench-stable cobalt precatalyst under 4 atm of H2 is reported herein. The catalyst precursor was reduced in situ using NaHBEt3, and the resulting Lewis acid formed, BEt3, was found to be integral to the observed catalysis. Mechanistic insights gleaned from para-hydrogen induced polarization (PHIP) transfer NMR studies revealed that the
本文报道了在 4 个大气压的 H 2 下使用实验室稳定的钴预催化剂将腈选择性氢化成伯胺。使用 NaHBEt 3 原位还原催化剂前体,并且发现所形成的路易斯酸 BEt 3 是观察到的催化作用的组成部分。从对氢诱导极化 (PHIP) 转移 NMR 研究中收集到的机理见解表明,腈的成对氢化是通过 Co(I/III) 氧化还原过程进行的。