Triazolo [1,5 - a ] triazin-7-one衍生物和高度官能化的[1,2,4]三唑的合成
摘要:
介绍了新型三唑并[1,5- a ]三嗪-7-ones的合成。从3-氨基-5-硫烷基-1,2,4-三唑开始,合成序列包括用苄基溴进行烷基化,与氯甲酸对硝基苯酯反应,然后用伯胺处理,并与二乙氧基甲基乙酸酯缩合。用3-氯过苯甲酸最终氧化硫醚部分,得到总体良好的2-(苄基磺酰基)[1,2,4]三唑[1,5- a ] [1,3,5]三嗪-7- a 5a和5b产量。5a和5b的治疗与仲胺的混合物通过意外的三嗪酮开环提供了高度官能化的[1,2,4]三唑。提出了这种转变的机制。
isocyanates via base-induced β-elimination of haloform N-monosubstituted trihaloacetamides is described. The rate of reaction exhibits a strong dependence on the nature of the trihalomethyl group. Thus, while the reaction of tribromoacetamides proceeds at room temperature and the reaction of trichloroacetamides requires heating in polar solvents, no reaction could be observed for any of the corresponding
excellent surface catalytic potential of Fe3O4–OSO3H is utilized in the synthesis of symmetrically and unsymmetrically substituted urea derivatives via transamidation reactions. The scope of the surface catalysis is further extended in transamidation reactions of cyclic and acyclic amide derivatives, and in the amidation of fatty acids. In both transamidation and amidation reactions, the catalyst is reusable
摘要 Fe 3 O 4 -OSO 3 H的优异的表面催化潜力可用于通过氨基转移反应合成对称和不对称取代的脲衍生物。在环和无环酰胺衍生物的氨基转移反应以及脂肪酸的酰胺化反应中,表面催化的范围进一步扩大。在氨基转移和酰胺化反应中,该催化剂可重复使用多达五次,而活性没有明显损失。 Fe 3 O 4 -OSO 3 H的优异的表面催化潜力可用于通过氨基转移反应合成对称和不对称取代的脲衍生物。在环和无环酰胺衍生物的氨基转移反应以及脂肪酸的酰胺化反应中,表面催化的范围进一步扩大。在氨基转移和酰胺化反应中,该催化剂可重复使用多达五次,而活性没有明显损失。
Synthesis of some N-alkyl substituted urea derivatives as antibacterial and antifungal agents
A series of N-alkyl substituted urea derivatives were synthesized and evaluated for their in vitro antibacterial and antifungal activities. The N-alkyl substituted urea derivatives bearing morpholine moiety (3a–3k) showed better activities than those bearing diethylamine moiety (2a–2f). Compounds having fluoro substituent at ortho (3c) and para (3b) positions of the phenyl ring exhibited potent antimicrobial
Phenyl 4,5-Dichloro-6-Oxopyridazine-1(6H)-Carboxylate as Carbonyl Source: Facile and Selective Synthesis of Carbamates and Ureas under Mild Conditions
作者:Yong-Jin Yoon、Hyung-Geun Lee、Min-Jung Kim、Song-Eun Park、Jeum-Jong Kim、Bo Kim、Sang-Gyeong Lee
DOI:10.1055/s-0029-1217997
日期:2009.10
The selective syntheses of carbamates, symmetric ureas, and unsymmetrical ureas have been accomplished by the reaction of amines with phenyl 4,5-dichloro-6-oxopyridazine-1(61H)-carboxylate as a carbonyl source under mild conditions. It is noteworthy that this process is mild, economic, and convenient.
Visible-light-promoted oxidative desulphurisation: a strategy for the preparation of unsymmetrical ureas from isothiocyanates and amines using molecular oxygen
作者:Ziyu Gan、Guoqing Li、Qiuli Yan、Weiseng Deng、Yuan-Ye Jiang、Daoshan Yang
DOI:10.1039/d0gc00070a
日期:——
A green and efficient visible-light promoted oxidative desulphurisation protocol has been proposed for the construction of unsymmetrical ureas under mild conditions with broad substrate scope and good functional group tolerance. Most appealingly, the reaction can proceed smoothly without adding any strong oxidants. Control experiments and computational studies support a mechanism involving water-assisted