A novel and efficient synthesis of 2,5-substituted 1,2,4-triazol-3-ones
摘要:
A novel procedure for preparing 1,2,4-triazol-3-ones is described. Various alkyl, aryl, and heterocyclic groups were introduced successfully at both the N2 and C5 positions. The triazolone ring was constructed through an intramolecular cyclization of a novel acyclic precursor, which in turn was synthesized by treating a mono protected hydrazine with an acyl isocyanate. Under conditions that remove the hydrazine protecting group, the intramolecular cyclization occurs rapidly, to deliver the 2,5-substituted 1,2,4-triazol-3-ones in excellent yields (79-99%) without column purification. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis, cyrstal structure, fungicidal activity and molecular docking of nicotinic acyl urea derivatives
作者:Pei-Pei Zhang、Qiao Wang、Li-Jing Min、Hong-Ke Wu、Jian-Quan Weng、Cheng-Xia Tan、Yong-Gang Zhang、Xing-Hai Liu
DOI:10.1016/j.molstruc.2019.127485
日期:2020.4
synthesized via four steps. Their structures were confirmed by 1H NMR, HRMS and X-ray diffraction. Some of these new nicotinic acyl urea derivatives(4d, 4g, 4h and 4k) had moderate fungicidalactivity against Gibberella zeae, Sclerotinia sclerotiorum, Rhizoctonia solani, Botrytis cinerea and Physalospora piricola at 50 mg/L, which is a little weaker than the commercial fungicide fluxapyroxad. The SAR was studied
摘要 以啶酰菌胺为先导化合物,设计了一系列烟碱酰基脲衍生物。它们通过四个步骤合成。它们的结构经 1H NMR、HRMS 和 X 射线衍射证实。这些新的烟碱酰基脲衍生物(4d、4g、4h和4k)中的一些对玉米赤霉、核盘菌、立枯丝核菌、灰葡萄孢和梨形孢霉的中度杀真菌活性为50 mg/L,比市售品稍弱杀菌剂fluxapyroxad。通过使用分子对接研究SAR。