A simple and versatile method to synthesize N-acyl-benzotriazoles
作者:Guillaume Laconde、Muriel Amblard、Jean Martinez
DOI:10.1016/j.tetlet.2018.12.046
日期:2019.1
An efficient method for the synthesis of N-acyl-benzotriazoles from a wide variety of protected amino acids, as well as from compounds frequently used in drug discovery such as biotin and N-Fmoc polyethyleneglycol, has been developed. The reaction of carboxylic acidderivatives with benzotriazole in the presence of T3P® yielded the corresponding N-acyl-benzotriazoles, which were obtained in high purity
Total synthesis of cyclic heptapeptide Rolloamide B
作者:Mirna El Khatib、Mohamed Elagawany、Eray Çalışkan、Emily Faith Davis、Hassan M. Faidallah、Said A. El-feky、Alan R. Katritzky
DOI:10.1039/c3cc39291k
日期:——
The first total synthesis of Rolloamide B, a cyclic proline-enriched heptapeptide, is reported. This work features solution phase benzotriazole-mediated peptide synthesis ligating native amino acids.
Unexpected Reactivity of <i>N</i>
-Acyl-Benzotriazoles with Aromatic Amines in Acidic Medium (ABAA Reaction)
作者:Guillaume Laconde、Muriel Amblard、Jean Martinez
DOI:10.1002/ejoc.201801567
日期:2019.1.10
A simple and practical approach for the synthesis of aromatic amides has been developed using N‐Acyl‐Benzotriazole derivatives and aromaticamines including anilines (ABAA reaction). The reaction is performed in acidic medium, is selective for the coupling of aromaticamines vs. aliphatic amines, and features broad functional group tolerance.
Synthesis, computational studies, antimycobacterial and antibacterial properties of pyrazinoic acid–isoniazid hybrid conjugates
作者:Siva S. Panda、Adel S. Girgis、Bibhuti B. Mishra、Mohamed Elagawany、Venkatasai Devarapalli、William F. Littlefield、Ahmed Samir、Walid Fayad、Nehmedo G. Fawzy、Aladdin M. Srour、Riham M. Bokhtia
DOI:10.1039/c9ra03380g
日期:——
Benzotriazole and microwave mediated syntheses led to a new set of hybrid conjugates of pyrazinoic acid with isoniazid via aminoacid linkers in excellent yields with retention of chirality. Microbiological screening of the synthesized conjugates revealed an exceptionally high activity against some of the pathogenic bacterial strains at low concentrations. Promising antimycobacterial properties were
Highly Diastereoselective Peptide Chain Extensions of Unprotected Amino Acids with<i>N</i>-(Z-α-Aminoacyl)benzotriazoles
作者:Alan R. Katritzky、Kazuyuki Suzuki、Sandeep K. Singh
DOI:10.1055/s-2004-831255
日期:——
Coupling an unprotected amino acid or dipeptide in partially aqueous solution with a readily available N-(Z-α-aminoacyl)benzotriazole or N-(Z-α-aminopetidoyl)benzotriazole affords N-terminal-protected di-, tri-, and tetrapeptides in yields of 85-98% (average 95% for 2a-i, 93% for 4a-f and 4a′, 86% for 5a-b) with minimal epimerization.