A Versatile One-Pot Synthesis of 4-Aryl-1,5-disubstituted 1,2,3-Triazoles via 1,3-Dipolar Cycloaddition Followed by Negishi Reaction under New Conditions
Several derivatives of 4-aryl-1,5-disubstituted 1,2,3-triazole were synthesized in good yields via 1,3-dipolar cycloaddition followed by Negishi reaction under new conditions.
Transition-metal-free regioselective construction of 1,5-diaryl-1,2,3-triazoles through dehydrative cycloaddition of alcohols with aryl azides mediated by SO<sub>2</sub>F<sub>2</sub>
作者:Xu Zhang、K. P. Rakesh、Hua-Li Qin
DOI:10.1039/c8cc09693g
日期:——
A novel, simple and practical method for mild, efficient, cost-effective and regioselective synthesis of highly valuable 1,5-diaryl-1,2,3-triazoles was developed.
A Metal-Free Multicomponent Cascade Reaction for the Regiospecific Synthesis of 1,5-Disubstituted 1,2,3-Triazoles
作者:Guolin Cheng、Xiaobao Zeng、Jinhai Shen、Xuesong Wang、Xiuling Cui
DOI:10.1002/anie.201307499
日期:2013.12.9
About specifics: A method for the regiospecific synthesis of the title compounds through an unprecedented Michael addition/deacylative diazo transfer/cyclization sequence has been established. The simple and practical method can be used for the modification of primary amines including chiral α‐amines. The process involves the formation three covalent bonds and the cleavage of two covalent bonds (see
A copper-catalyzed decarboxylative regioselective protocol for the synthesis of 1,5-disubstituted 1,2,3-triazoles through direct annulation of cinnamic acids with aryl azides has been developed. This is the first example of 1,5-disubstituted 1,2,3-triazoles, under aerobic conditions using Cu(II) as the catalyst, which were generally synthesized using a ruthenium(II) catalyst. The simplicity and regioselectivity
(3+2) Cycloadditions of Vinyl Sulfonyl Fluorides with Ethyl Diazoacetate or Azides: Metal-Free Synthesis of Pyrazole and Triazole Scaffolds via SO2 Elimination
作者:K. C. Kumara Swamy、K. Sandeep、A. Sanjeeva Kumar、Asif Ali Qureshi
DOI:10.1055/s-0041-1737485
日期:2022.9
A (3+2) cycloaddition reaction between substituted vinyl sulfonyl fluorides and ethyl diazoacetate or azides for the rapid construction of pyrazole or triazole cores via Michael addition and SO2 gas elimination is developed. Trimethylsilyl azide or organic azideselectively attacks at the β-carbon of vinyl sulfonyl fluoride rather than at the S(VI) center and generates C-substituted or C,N-disubstituted
开发了取代乙烯基磺酰氟与重氮乙酸乙酯或叠氮化物之间的 (3 + 2) 环加成反应,用于通过迈克尔加成和 SO 2气体消除快速构建吡唑或三唑核。三甲基甲硅烷基叠氮化物或有机叠氮化物选择性地攻击乙烯基磺酰氟的β-碳而不是S(VI)中心,并生成C-取代或C,N-二取代三唑。相比之下,乙烯基磺酰氟与重氮乙酸乙酯反应生成吡唑,产率从好到高。