A nickel-promoted cascadeannulation reaction for the facile synthesis of 3H-1,2,4-triazol-3-ones from readily available hydrazonoyl chlorides and sodium cyanate has been developed. The transformation occurs through a cascade nickel-promoted intermolecular nucleophilic addition–elimination process, intramolecular nucleophilic addition, and a hydrogen-transfer sequence. The method has been successfully
已经开发了镍促进的级联环化反应,用于从容易获得的酰肼基氯和氰酸钠容易地合成3 H -1,2,4-三唑-3-酮。通过级联镍促进的分子间亲核加成-消除过程,分子内亲核加成和氢转移序列进行转化。该方法已成功应用于血管紧张素II拮抗剂的核心骨架的构建。
Copper(<scp>ii</scp>)-catalyzed coupling reaction: an efficient and regioselective approach to N′,N′-diaryl acylhydrazines
作者:Ji-Quan Zhang、Gong-Bin Huang、Jiang Weng、Gui Lu、Albert S. C. Chan
DOI:10.1039/c4ob02343a
日期:——
An efficient and regioselective copper(ii)-catalyzed coupling reaction of N′-aryl acylhydrazines for the synthesis of N′,N′-diaryl acylhydrazines has been developed.
Asymmetric NHC-Catalyzed Redox α-Amination of α-Aroyloxyaldehydes
作者:James E. Taylor、David S. B. Daniels、Andrew D. Smith
DOI:10.1021/ol402955f
日期:2013.12.6
(NHC)-catalyzed redox reaction of α-aroyloxyaldehydes with N-aryl-N-aroyldiazenes to form α-hydrazino esters with highenantioselectivity (up to 99% ee) is reported. The hydrazide products are readily converted into enantioenriched N-aryl amino esters through samarium(II) iodidemediated N–N bond cleavage.
[3+3] Cycloadditions of Azomethine Ylides with Nitrile Imines for the Synthesis of 2,3,4,5‐Tetrahydro‐1,2,4‐Triazine‐5‐Carboxylates
作者:Limei M. Gao、Xiaomeng M. Wang、Qinglang L. Wei、Kexin X. Su、Renhong H. Huang、Ju Guo、Yongsheng S. Zheng、Jikai K. Liu
DOI:10.1002/ejoc.202200768
日期:2022.9.20
[3+3] cycloaddition of azomethineylides with nitrile imines was established to access unnatural cyclic amino acids containing 1,2,4-triazines. A series of 2,3,4,5-tetrahydro-1,2,4-triazine-5-carboxylates were obtained in moderate to excellent yields under mild reaction conditions.
A series of simple diarylhydrazide derivatives (45 examples) were well-designed, prepared, and screened for their antifungal activities both in vitro and in vivo. Bioassay results suggested that all designed compounds had significant activity against Alternaria brassicae (EC50 = 0.30–8.35 μg/mL). Among of them, 2c, as the highest activity compound, could effectively inhibit the growth of plant pathogens