We established an in vitro assay for the addition of glycosyl-phosphatidylinositol (GPI) anchors to proteins using procyclic trypanosomes engineered to express GPI-anchored variant surface glycoprotein (VSG). The assay is based on the premise that small nucleophiles, such as hydrazine, can substitute for the GPI moiety and effect displacement of the membrane anchor of a GPI-anchored protein or ...

The catalytic asymmetric aza-Michael reaction of benzoyl hydrazine toward chalcones through the nonactivated amine moiety conjugated addition was facilitated by the developed N,N'-dioxide-Sc(OTf)(3) complex under mild conditions, affording the pharmacologically and synthetically useful products in moderate to high yields with up to 97% ee.

The monomeric aluminium hydrazide H10 C5 NN(AltBu2 )Ad (4; Ad=adamantyl, NC5 H10 =piperidinyl) was obtained in high yield by hydroalumination of the corresponding hydrazone derivative 1. Compound 4 has a strained AlN2 heterocycle formed by a donor-acceptor bond between the β-nitrogen atom of the hydrazide group and the aluminium atom. Opening of this bond resulted in the formation of an activ...

Dynamic covalent networks (DCNs) use chemical bonds that break and reform at appropriate processing conditions to allow reconfiguration of the networks. Recently, acylsemicarbazide (ASC) motif has been added repertoire such dynamic bonds, which is capable hydrogen bonding as well bond exchange. In this study, we show its sulfur congener, thioacylsemicarbazide (TASC), also acts a bond, but excha...

The present work includes synthesis of new series heterocyclic derivatives containing 6-amino-1,3-dimethyl uracil moiety linked to 1,2,4-triazole [6-8 and 10]. first way reaction 6-amino-1,3-dimethyluracil with ethyl chloroacetate K2CO3 as catalyst in DMF solvent gives ester derivative [1]. Then, compound [1] was converted into (semicarbazide, thiosemicarbazide, phenylsemicarbazide hydrazide de...

The preparation of two types of imidazole derivatives bearing a hydrazide group was achieved by treatment of the corresponding esters with NH2NH2·H2O in MeOH at room temperature. In the case of 4-(ethoxycarbonyl)-1H-imidazole 3-oxides 3, hydrazides of type 1 were formed with retention of the N-oxide structure (Scheme 1). Interestingly, due to a strong H-bonding, no deoxygenation of the N-O func...

A fundamental structural feature of benzimidazoles, a group heterocyclic, aromatic compounds, is the fusion six-membered benzene ring with five-membered imidazole moiety. Formic acid, Acetyl chloride, hydrazine hydrate, Benzene-1,2-diol, Glycolic Acid, Benzoyl Methyl Ethyl Benzamide, and other chemicals were utilized in this research study. In study different methods used such as TLC, IR spectr...

The aim of present study was to design and synthesized a novel series compound which can be evaluate for anticonvulsant, anti-microbial activity. This derivatives Arylidene Hydrazides (4a-4k) were synthesised from o-chloro benzoic acid aniline via Ulmann reaction. synthetic method used simple, rapid economical found accurate reproducible. chemical reaction yielded as 11 Arylidiene Hydrazide acc...

A series of hydrazones were synthesized by condensing substituted hydrazides with appropriate carbonyl compounds. The chemical structures the compounds confirmed infrared, proton nuclear magnetic resonance, carbon-13 mass ((4-chloro-phenylamino)-acetic acid [1-(4-chlorophenyl)-phenyl-methylene]-hydrazide and (2,4-dichloro-phenylamino)-acetic (3-oxo- 1,3-dihydro-indole-2-ylidene)-hydrazide only)...