Fluorescent Probes from Stable Aromatic Nitrile Oxides
作者:Luigi Ferdinando Minuti、Misal Giuseppe Memeo、Stefano Crespi、Paolo Quadrelli
DOI:10.1002/ejoc.201501478
日期:2016.2
Stable aromaticnitrileoxides underwent a 1,3-dipolar cycloaddition reaction with 1-iodo-4-(prop-2-yn-1-yloxy)benzene to afford the expected isoxazoles in very good yields as single regioisomers. The formation of the 5-substituted isoxazoles is in agreement with frontier orbital theory. The reductive cleavage of the N–O bond followed by complexation with BF3·Et2O afforded the corresponding boron complexes
Cycloaddition of Trifluoroacetaldehyde <i>N</i>-Triftosylhydrazone (TFHZ-Tfs) with Alkynes for Synthesizing 3-Trifluoromethylpyrazoles
作者:Hongwei Wang、Yongquan Ning、Yue Sun、Paramasivam Sivaguru、Xihe Bi
DOI:10.1021/acs.orglett.0c00395
日期:2020.3.6
(TFHZ-Tfs) and alkynes is reported. This protocol provides an operationally simple and general method for the synthesis of diverse 3-trifluoromethylpyrazoles in good to excellent yields with broad substrate scope, including aryl, heteroaryl, and alkyl terminalalkynes, and electron-deficient internalalkynes. The synthetic potential of this method was further demonstrated by the synthesis of an antiarthritic
The copper‐photocatalyzed borylation of aryl, heteroaryl, vinyl and alkyl halides (I and Br) was reported. The reaction proceeded using a new heteroleptic Cu complex under irradiation with blue LEDs, giving the corresponding boronic‐acid esters in good to excellent yields. The reaction was extended to continuous‐flow conditions to allow an easy scale‐up. The mechanism of the reaction was studied and
据报道,铜光催化的芳基,杂芳基,乙烯基和烷基卤化物(I和Br)的硼化反应。该反应在蓝色LED的照射下使用一种新型的杂铜配合物进行,从而得到了相应的硼酸酯,收率良好至极佳。反应扩展到连续流动条件,以易于放大。研究了该反应的机理,并提出了基于还原淬灭(Cu I / Cu I * / Cu 0)的机理。
Cu(I)-Catalyzed Efficient Synthesis of 2′-Triazolo-nucleoside Conjugates
作者:D. Mathur、N. Rana、C. E. Olsen、V. S. Parmar、A. K. Prasad
DOI:10.1002/jhet.2159
日期:2015.5
2′‐azido‐2′‐deoxy‐5‐methyluridine with different alkynes and aryl propargyl ethers in almost quantitative yields. Triazolo‐nucleoside conjugates, which can be evaluated for different biological activity for suitable drug development, were unambiguously identified on the basis of 1H NMR, 13C NMR, IR, and HRMS data analysis. These compounds have been synthesized for the first time and have not been reported
通过Cu(I)催化2'-叠氮基2'-脱氧尿苷和2'-叠氮基2'的缩合反应合成了一个由32个2'-三唑基尿苷和2'-三唑基-5-甲基尿苷组成的小型文库带有不同炔烃和芳基炔丙基醚的脱氧-5甲基尿苷,收率基本定量。在1 H NMR,13 C NMR,IR和HRMS数据分析的基础上,明确鉴定出三唑-核苷共轭物,可以针对不同的生物学活性进行评估,以开发合适的药物。这些化合物是首次合成,并且在早期文献中没有报道。