Inhibition of escherichia coli glucosamine synthetase by novel electrophilic analogues of glutamine—comparison with 6-diazo-5-oxo-norleucine
摘要:
A series of electrophilic glutamine analogues based on 6-diazo-5-oxo-norleucine has been prepared, using novel synthetic routes, and evaluated as inhibitors of Escherichia coli. glucosamine synthetase. The gamma -dimethylsulphonium salt analogue of glutamine was found to be one of the most potent inactivators of this enzyme yet reported, with an apparent second order rate constant (k(2)/K-i) of 3.5 x 10(5) M-1 min(-1). (C) 2000 Elsevier Science Ltd. All rights reserved.
Rhodium(I) and Iridium(I) N-Heterocyclic carbene complexes of imidazolium functionalized amino acids and peptides
作者:Isabelle Marie Daubit、Jonas Wolf、Nils Metzler-Nolte
DOI:10.1016/j.jorganchem.2019.121096
日期:2020.3
rhodium(I), iridium(I), iridium(III), palladium(II) and ruthenium(III) N-heterocyclic carbene (NHC) complexes of the single amino acid and peptides containing this amino acid. Here, we have synthesized two new, non-natural imidazolium functionalized amino acid derivatives, which were used for solid phase peptide synthesis and for the synthesis of [M(COD)(NHC)Cl] (COD = 1,5 cyclooctadiene) complexes of Rh(I)
“BOP” as a reagent for mild and efficient preparation of esters
作者:Moon H. Kim、Dinesh V. Patel
DOI:10.1016/s0040-4039(00)77257-1
日期:1994.8
A simple procedure for preparation of esters under mild conditions employing the BOP reagent is reported. Acid and base labile protecting groups commonly used with aminoacids e.g. t-butyl, Fmoc etc., are well tolerated under these conditions. The mechanism and scope of this reaction are briefly discussed.
作者:M. L. Di Gioia、P. Costanzo、A. De Nino、L. Maiuolo、M. Nardi、F. Olivito、A. Procopio
DOI:10.1039/c7ra04425a
日期:——
A mild method for an efficient removal of the fluorenylmethoxycarbonyl (Fmoc) group in ionic liquid was developed. The combination of a weak base such as triethylamine and [Bmim][BF4] makes the entire system more efficient for the cleavage at room temperature of various amines and aminoacid methyl esters in short reaction times. The procedure works well even in the case of N-Fmoc aminoacids bearing
modify aminoacids, the C-terminus carboxylic acid usually needs to be protected, typically as a methyl ester. However, standard cleavage of methyl esters requires either highly basic or acidic conditions, which are not compatible with Fmoc or acid-labile protecting groups. This highlights the need for orthogonal conditions that permit selective deprotection of esters to create SPPS-ready amino acids
Novel selenophene compounds useful as anti-tumor agents are described. Preferred compounds include compounds of formula I:
wherein R
1
and R
2
are independently selected from the group consisting of
H, CHO, CH
2
OH, and CH
2
NH
2
; and
X and Y are independently selected from the group consisting of Se, S, O, NCH
3
, and NH. Pharmaceutical compositions and a method for treating patients having tumors utilizing the disclosed selenophene compounds are also described.