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.
Condensation of acyl chloride on sodium cyanate : preparation of acyl isocyanates
作者:M.-Z. Deng、P. Caubere、J.P. Senet、S. Lecolier
DOI:10.1016/s0040-4020(01)89797-0
日期:1988.1
The catalytic effects of various metal halides and solvents on the reaction of benzoyl chloride with sodiumcyanate were studied. It has been found that SnCl4, and ZnCl2. catalyze the reaction to give the corresponding acyl isocyanates in good yields. The scope of the reaction was studied and a number of aroyl isocyanates and their derivatives were prepared. A few non aromatic isocyanates and their
[EN] CARBAMOYLOXY DERIVATIVES OF MUTILINE AND THEIR USE AS ANTIBACTERIALS<br/>[FR] DERIVES CARBAMOYLOXY DE MUTILINE ET LEUR UTILISATION EN TANT QU'AGENTS ANTIBACTERIENS
申请人:SMITHKLINE BEECHAM PLC
公开号:WO1997025309A1
公开(公告)日:1997-07-17
(EN) Derivatives of mutiline of formula (1A) and pharmaceutically acceptable salts and derivatives thereof, in which R1 is ethyl or vinyl, Y is a carbamoyloxy group, in which the N-atom is unsubstituted, or mono- or di-substituted, are useful in the treatment of bacterial infections.(FR) Dérivés de mutiline représentés par la formule (1A), ainsi que leurs sels et dérivés pharmaceutiquement acceptables, dans laquelle R1 représente éthyle ou vinyle, Y représente un groupe carbamoyloxy, dans lequel l'atome N est non substitué, ou mono ou di-substitué. Ces composés sont utiles dans le traitement d'infections bactériennes.
Synthesis of unsymmetrical trisubstituted 1,3,5-triazines compounds
作者:Jing Zhao、Yuanyuan Chen、Xingyi Wang、Weiqing Yang、Aigui Zhang、Zhonghua Qu、Haiyan Fu、Menglin Ma
DOI:10.1016/j.tet.2024.134009
日期:2024.6
chloride. Subsequently, 21 target products of 2-chloro-4-R-6-R-1,3,5-triazines compounds were obtained through the cyclization of substituted benzoyl isocyanates with benzamidine hydrochloride at relatively low temperatures and a one-pot chlorination reaction. The second method involved the synthesis of the same 21 compounds of 2-chloro-4-R-6-R-1,3,5-triazines by reacting benzamide with oxalyl chloride