A series of macrocyclic imides and Schiff-bases have been prepared via the cyclocondensation of pyridine-2,6-dicarbonyl dichloride (1) with L-ornithine methyl ester to give the corresponding macrocyclic bisester 2. Treatment of 2 with hydrazine hydrate gave macrocyclic bisacid hydrazide 3, which was used as starting material. Condensation of bishydrazide 3 with diacid anhydrides or aromatic ald...

magnetic resonance imaging (mri) contrast agents most commonly agents used in diagnosing different diseases. several agents have been ever introduced with different peculiar characteristics. they vary in potency, adverse reaction and other specification, so it is important to select the proper agent in different situations. we conducted a systematic literature search in medline/pubmed, web of s...

Macrocyclic complexes of Mn, Co, Ni and Cu using a macrocyclic ligand derived by the condensation of Trimethoprim and diethyl phthalate have been prepared and characterized by electronic, IR and NMR spectral studies as well as magnetic moment and conductivity. On the basis of spectral studies, an octahedral geometry has been proposed for all the complexes. INTRODUCTION: The chemistry of macrocy...

Macrocyclic peptides are a promising class of compounds that can often engage challenging therapeutic targets. Display technologies, such as mRNA display, allow for the efficient discovery macrocyclic peptides. This article reviews current approaches generating peptide libraries using display and highlights some recent examples ribosomal incorporation nonproteinogenic amino acids into

Cadmium promoted diastereoselective amplification of a single member from a dynamic combinatorial library of stereoisomeric oligoimines of different sizes allows the efficient preparation of a new macrocyclic polyamine.

A domino process is described combining an ene reaction between two alkynes and a Diels-Alder cycloaddition of the vinylallene formed. The process accounts for the thermally induced cycloisomerization of macrocyclic triynes and enediynes to give fused tetracycles in a stereoselective manner.

Two unprecedented cyclic peptides, Solomonamides A (1) and B (2), were recently isolated from the marine sponge Theonella swinhoei [1] by the Zampella’s group [2]. Preliminary structural studies revealed a novel cyclic peptide type structure, whose absolute configuration must be still confirmed. Interestingly, solomonamide A exhibits anti-inflammatory activity, showing significant reduction (60...

Abstract Chemical pesticides are essentially hazardous. The risks differ from compound to compound, and much of the information on their actions insect development remains be captured. toxicity abamectin (a macrocyclic lactone, acting glutamate-gated chloride channels insects), fipronil phenylpyrazole, disrupting GABA receptors) was given embryos short-horned grasshopper Heteracris littoralis (...