Synthesis and anti-trypanosomal activity of novel 5-nitro-2-furaldehyde and 5-nitrothiophene-2-carboxaldehyde semicarbazone derivatives
摘要:
Several novel semicarbazones derivatives were prepared from 5-nitro-2-furaldehyde or 5-nitrothiophene-2-carboxaldehyde, and tested in vitro as potential anti trypanosomal agents. The compounds were prepared in good to excellent yields in 2-3 steps from readily available starting materials. Some derivatives were found to be active against Trypanosoma cruzi with an activity similar to that of Nifurtimox. (C) 1998 Elsevier Science S.A. All rights reserved.
我们报告了一种新的电化学无负载电解质方法,用于通过草酸氧化合成尿素、氨基甲酸酯和硫代氨基甲酸酯。这种简单、实用且无光气的路线包括在有机碱存在下通过草酸的阳极脱羧原位生成异氰酸酯中间体,然后一锅加入合适的亲核试剂以提供相应的尿素,氨基甲酸酯和硫代氨基甲酸酯。此程序适用于不同的胺、醇和硫醇。此外,当使用单程连续电化学流动条件并且该反应在碳石墨 C gr /C gr 在流动池中,可以在 6 分钟的停留时间内以高产率获得尿素化合物,解锁在批量条件下无法访问的底物,同时易于扩展。
Preparation of substituted semicarbazides from corresponding amines and hydrazines via phenyl carbamates
作者:Rebecca Hron、Branko S. Jursic
DOI:10.1016/j.tetlet.2014.01.052
日期:2014.2
A simple synthetic procedure for the conversion of amines and hydrazines into substituted semicarbazides was developed. The initial condensation between the desired amine and phenyl chloroformate into phenyl carbamate is followed by the addition of hydrazine under basic conditions. The reaction is tolerable to a variety of functional groups, with mild conditions and high percent yields.
A novel and simple approach to the synthesis of sulfonylureas has been reported. It involved the reaction of various amines with diphenyl carbonate to yield the corresponding carbamates, which subsequently reacted with different sulphonamides to produce different sulfonylureas in excellent yields. The first reaction of diphenyl carbonate with amines was carried out in aqueous:organic (H2O:THF, 90:10)
已经报道了一种新颖且简单的合成磺酰脲类的方法。它涉及各种胺与碳酸二苯酯的反应,以产生相应的氨基甲酸酯,其随后与不同的磺酰胺反应,以优异的产率产生不同的磺酰脲类。碳酸二苯酯与胺的第一反应是在室温下于水性:有机(H 2 O :THF,90 : 10)介质中进行的,以生成氨基甲酸酯,该氨基甲酸酯与磺酰胺反应后,直接通向磺酰脲类。上述方法避免了传统的多步骤方案,并且避免使用有害,刺激性,有毒和对水分敏感的试剂,例如光气,异氰酸酯和/或氯甲酸酯。
Facile One-Pot Synthesis of Substituted Hydantoins from Carbamates
作者:Manjinder Gill、Dinesh Tanwar、Anjali Ratan
DOI:10.1055/s-0036-1588468
日期:2017.10
A novel and simple approach for the preparation of 3-substituted, 5-substituted, or 3,5-disubstituted hydantoins is reported. It involves the reaction of α-amino methyl ester hydrochlorides with carbamates to yield the corresponding ureido derivatives, which subsequently cyclize under basic conditions to produce substituted hydantoins in good yields. By applying this method, the bioactive anticonvulsant
The synthesis and biological evaluation of para-substituted phenolic N-alkyl carbamates as endocannabinoid hydrolyzing enzyme inhibitors
作者:Anna Minkkilä、Mikko J. Myllymäki、Susanna M. Saario、Joel A. Castillo-Melendez、Ari M.P. Koskinen、Christopher J. Fowler、Jukka Leppänen、Tapio Nevalainen
DOI:10.1016/j.ejmech.2009.01.007
日期:2009.7
A series of para-substituted phenolic N-alkyl carbamates were evaluated for their FAAH and MGL inhibitory activities. The compounds were generally selective for FAAH, with IC50 values in the nM range, whereas inhibition of MGL required concentrations three orders of magnitude higher. The most potent compounds, dodecylcarbamic acid 4-(4,5-dihydrothiazol-2-yl)phenyl (12) and 4-(1,2,3-thiadiazol-4-yl)phenyl (26) esters, inhibited FAAH and MGL with IC50 values at the low-nanomolar (IC(50)s: 0.0063 and 0.012 mu M) and the low-micromolar ranges (IC(50)s; 2.1 and 1.0 mu M), respectively. Compound 26 also inhibited both FAAH-dependent AEA uptake and AEA hydrolysis (IC50; 0.082 mu M) by intact RBL2H3 cells, and could also reduce 2-AG hydrolysis by these cells at concentrations >= 0.030 mu M. (C) 2009 Elsevier Masson SAS. All rights reserved.
[EN] METHOD FOR PRODUCING N-SUBSTITUTED TRIHALOACETAMIDE<br/>[FR] PROCÉDÉ DE PRODUCTION DE TRIHALOACÉTAMIDE N-SUBSTITUÉ<br/>[JA] N-置換トリハロアセトアミドの製造方法