Green, Catalyst-Free Synthesis of Mesalazine Conjugates
摘要:
A greener protocol for the synthesis of mesalazine conjugates is reported. Mesalazine conjugates are prepared in high yields by a one-pot reaction of mesalazine and aminoacyl/peptidoylbenzotriazoles in water under microwave irradiation.
作者:Siva S. Panda、Claudia El-Nachef、Kiran Bajaj、Alan R. Katritzky
DOI:10.1002/ejoc.201201731
日期:2013.7
(α-Benzyloxycarbonyl-aminoacyl)benzotriazolides (Cbz = benzyloxycarbonyl) underwent a coupling reaction with α-hydrazino acids under microwave irradiation to form hybrid hydrazino dipeptides (42–71 %). Chiral acylations of β-N-Cbz-α-hydrazino acylbenzotriazolides were successfully carried out with N-, S-, O-, and C-nucleophiles in yields of 49–88 %.
Synthesis and antibacterial evaluation of amino acid–antibiotic conjugates
作者:Mohamed A. Ibrahim、Siva S. Panda、Antoinette S. Birs、Juan C. Serrano、Claudio F. Gonzalez、Khalid A. Alamry、Alan R. Katritzky
DOI:10.1016/j.bmcl.2014.01.065
日期:2014.4
Amino acid conjugates of quinolone, metronidazole and sulfadiazine antibiotics were synthesized in good yields using benzotriazole methodology. All the conjugates were screened for their antibacterial activity using methods adapted from the Clinical and Laboratory Standards Institute. Antibiotic conjugates were tested for activity in four medically relevant organisms; Staphylococcus aureus (RN4220), Escherichia coli (DH5a), Pseudomonas aeruginosa (PAO1), and Bacillus subtilis (168). Several antibiotic conjugates show promising results against several of the strains screened. (c) 2014 Published by Elsevier Ltd.
Chemical modification of oximes with N-protected amino acids
作者:Nana N. Barbakadze、Rachel A. Jones、Nicole Rivera Rosario、Nanuli Sh Nadaraia、Meri L. Kakhabrishvili、C. Dennis Hall、Alan R. Katritzky
DOI:10.1016/j.tet.2014.07.040
日期:2014.10
The modification of oximes, including 5 alpha-steroids, with N-protected amino acids, in solution phase, using benzotriazole methodology is reported. (C) 2014 Elsevier Ltd. All rights reserved.
Amino Acyl Conjugates of Nitrogen Heterocycles as Potential Pharmacophores
作者:Alan R. Katritzky、Kiran Bajaj、Mael Charpentier、Ebrahim Ghazvini Zadeh
DOI:10.1021/jo100625y
日期:2010.6.4
2-Methyl- and 4-methylpyridine and 2-methylquinoline are converted by benzotriazole-activated (Cbz)-protected amino acids into chiral potential novel pharmacophore aminoacyl conjugates (33-53%).
Synthesis and Antimalarial Bioassay of Quinine - Peptide Conjugates
作者:Siva S. Panda、Mohamed A. Ibrahim、Hasan Küçükbay、Marvin J. Meyers、Francis M. Sverdrup、Said A. El-Feky、Alan R. Katritzky
DOI:10.1111/cbdd.12134
日期:2013.10
Amino acid and peptide conjugates of quinine were synthesized using microwave irradiation in 52–95% yields using benzotriazole methodology. The majority of these conjugates retain in vitro antimalarial activity with IC50 values below 100 nm, similar to quinine.
使用苯并三唑方法,使用微波辐射以52–95%的产率合成奎宁的氨基酸和肽共轭物。这些结合物中的大多数保留体外抗疟活性,IC 50值低于100 n m,类似于奎宁。