61788-25-8Relevant academic research and scientific papers
Efficient and accessible silane-mediated direct amide coupling of carboxylic acids and amines
D'Amaral, Melissa C.,Jamkhou, Nick,Adler, Marc J.
supporting information, p. 288 - 295 (2021/01/28)
A straightforward method for the direct synthesis of amides from amines and carboxylic acids without exclusion of air or moisture using diphenylsilane with N-methylpyrrolidine has been developed. Various amides are made efficiently, and broad functional group compatibility is shown through a Glorius robustness study. A gram-scale synthesis demonstrates the scalability of this method. This journal is
Facile synthesis and biological evaluation of assorted indolyl-3-amides and esters from a single, stable carbonyl nitrile intermediate
Veale, Clinton G.L.,Edkins, Adrienne L.,De La Mare, Jo-Anne,De Kock, Carmen,Smith, Peter J.,Khanye, Setshaba D.
, p. 1860 - 1864 (2015/03/30)
The synthesis of biologically relevant amides and esters is routinely conducted under complex reaction conditions or requires the use of additional catalysts in order to generate sensitive electrophilic species for attack by a nucleophile. Here we present the synthesis of different indolic esters and amides from indolyl-3-carbonyl nitrile, without the requirement of anhydrous reaction conditions or catalysts. Additionally, we screened these compounds for potential in vitro antimalarial and anticancer activity, revealing 1H-indolyl-3-carboxylic acid 3-(indolyl-3-carboxamide)aminobenzyl ester to have moderate activity against both lines.
Direct synthesis of amides from coupling of alcohols and amines catalyzed by ruthenium(II) thiocarboxamide complexes under aerobic conditions
Sindhuja, Elangovan,Ramesh, Rengan,Balaji, Sundarraman,Liu, Yu
, p. 4269 - 4278 (2014/12/09)
Four octahedral ruthenium(II) thiocarboxamide complexes of the general formula [RuClCO(AsPh3)2(L)] (L = N-substituted pyridine-2-thiocarboxamide) incorporating carbonyl and triphenylarsine have been synthesized from the reaction of 1 equiv of ruthenium precursor [RuHClCO(AsPh3)3] with 1 equiv of thiocarboxamide ligands in refluxing ethanol in the presence of base. All the new complexes have been fully characterized by means of elemental analysis, IR, UV-vis, and NMR spectral methods. Molecular structures of all the complexes were determined by X-ray crystallography, which confirm the coordination mode of thiocarboxamide and reveal the presence of a distorted octahedral geometry around the Ru ion. All the ruthenium(II) thiocarboxamide complexes were generated as highly efficient catalysts for synthesis of secondary or tertiary amides by coupling of amines and alcohols with low catalyst loading, and the maximum yield was obtained up to 97%. The coupling reaction can be readily carried out under mild aerobic conditions, and release of water is the only byproduct. Further, the effect of substituents of the ligand, solvents, reaction temperature, time, and catalyst loading on the catalytic activity of the complexes has been investigated. A plausible mechanism is proposed for the synthesis of amides via hemiaminal as intermediate through an oxidation of an alcohol to aldehyde.
Synthesis of some analogs of indole phytoalexins brassinin and methoxybrassenin B and their positional isomers
Kutschy, Peter,Dzurilla, Milan,Takasugi, Mitsuo,Sabova, Adriana
, p. 348 - 362 (2007/10/03)
Treatment of indole-3-carboxylic acid with phosphorus trichloride and subsequent reaction of the obtained acid chloride with potassium thiocyanate afforded indol-3-ylcarbonyl isothiocyanate (13). Its treatment with sodium hydrogensulfide in the presence of methyl iodide lead to the corresponding methyl dithiocarbamate, an oxo derivative of brassinin (oxobrassinin, 14), which by methylation with methyl iodide afforded brassenin B (8). Corresponding 2-isomers, 21 and 23, were obtained by an analogous sequence, starting from indole-2-carboxylic acid. During the preparation of isooxobrassinin (21), which appeared to be unstable in the basic reaction medium, also an imidazo[3,4-a]indole derivative 22 has been isolated as an unexpected side product. Related oxobrassinin analogs and their 2-isomers were prepared by treatment of indol-3-and indol-2-ylcarbonyl isothiocyanate with methanol and amines. In the case of isothiocyanate 13, besides the expected products of nucleophilic addition to NCS group (monothiocarbamate 25a and thiourea derivatives 25b-25g), also the substitution products were obtained. Their formation could be explained by partial decomposition of the starting isothiocyanate to an unstable ketene, which reacts with methanol and amines to afford the corresponding methyl carboxylate 26a and carboxamides 26b-26g. Antifungal activity of the prepared compounds has been examined, using the fungus Bipolaris leersiae. All of the compounds exhibited lower activity than phytoalexin brassinin.
