“Click” Synthesis of Nonsymmetrical Bis(1,2,3-triazoles)
摘要:
Unsymmetrically 1,1'-disubstituted 4,4'-bis-1H-1,2,3-triazoles 4 have been prepared from 4-ethynyl-1,2,3-triazoles 5 and azides. Following a "double-click" strategy, two complementary approaches were implemented for the preparation of the key 4-ethynyltriazole intermediates 5: (a) the stepwise Swern oxidation/Ohira-Bestman alkynylation of readily available 4-hydroxymethyl-1,2,3-triazoles 8 and (b) the stepwise cycloaddition of TMS-1,4-butadlyne 9. The method is highlighted by its compatibility with orthogonally protected and functionalized saccharide-peptide hybrids and its ability to be extended to the trisubstituted counterparts 12.
Greener photocatalytic route to azide-alkyne cycloaddition reactions: Role of hole/oxygen in air
作者:Subhendu Sekhar Bag、Sayantan Sinha、Siddharth Singh、Animes K. Golder
DOI:10.1016/j.tet.2023.133703
日期:2023.12
for base-free click reaction in the green solvent with high efficiency, selectivity and fast reaction kinetics. Thus, the synthesized heterogeneous photocatalyst based on Cu(II) ion-doped TiO2 nanocomposite [CuII@TiO2] is found to be highly efficient for carrying out azide-alkyne 1,3-dipolar cycloaddition reaction (CuAAC) in an aqueous environment without needing a base. The reaction features high product
我们结合了 Cu I和 Cu II的特性,代表了一种独特且智能的纳米光催化系统,可作为绿色溶剂中无碱点击反应的催化剂,具有高效率、选择性和快速反应动力学。因此,基于Cu(II)离子掺杂的TiO 2纳米复合材料合成的异相光催化剂[Cu II @TiO 2 ]被发现对于在水溶液中进行叠氮-炔1,3-偶极环加成反应(CuAAC)非常有效。环境,无需基础。该反应具有产物选择性高、反应条件温和、绿色溶剂、底物范围广、周转数优异、收率高、反应动力学快、官能团相容性好等特点。从机理上讲,在光照射(λ = 400 nm)时,TiO 2纳米核将电子从其价带释放到导带,进而光化学地将 Cu(II) 还原为 Cu(I),从而实现对 CuAAC 反应的空间和时间控制。另一方面,空气中产生的空穴和/或氧气作为绿色氧化剂维持Cu(I)至Cu(II)催化循环。因此,产生的电子和空穴的协同作用持续维持催化循环,实现对点击
Novel 1,2,3-Triazole Derivatives for Use against <i>Mycobacterium tuberculosis</i> H37Rv (ATCC 27294) Strain
作者:Nubia Boechat、Vitor F. Ferreira、Sabrina B. Ferreira、Maria de Lourdes G. Ferreira、Fernando de C. da Silva、Monica M. Bastos、Marilia dos S. Costa、Maria Cristina S. Lourenço、Angelo C. Pinto、Antoniana U. Krettli、Anna Caroline Aguiar、Brunno M. Teixeira、Nathalia V. da Silva、Priscila R. C. Martins、Flavio Augusto F. M. Bezerra、Ane Louise S. Camilo、Gerson P. da Silva、Carolina C. P. Costa
DOI:10.1021/jm2003624
日期:2011.9.8
The purpose of this study was to prepare various 4-substituted N-phenyl-1,2,3-triazole derivatives using click chemistry. The derivatives were screened in vitro for antimicrobial activity against Mycobacterium tuberculosis strain H37Rv (ATCC 27294) using the Alamar Blue susceptibility test. The activity was expressed as the minimum inhibitory concentration (MIC) in mu g/mL (mu M). Derivatives of isoniazid (INH), (E)-N'-[(1-aryl)-1H-1,2,3-triazole-4-yl)methylene] isonicotinoyl hydrazides, exhibited significant activity with MIC values ranging from 2.5 to 0.62 mu g/mL. In addition, they displayed low cytotoxicity against liver cells (hepatoma HepG2) and kidney cells (BGM), thereby providing a high therapeutic index. The results demonstrated the potential and importance of developing new INH derivatives to treat mycobacterial infections.
COMPOUNDS
申请人:UCL BUSINESS LTD
公开号:US20210171475A1
公开(公告)日:2021-06-10
A compound for use in the treatment of a disease ameliorated by the inhibition of Notum of formula (I): (I)