• Crystallography on 1 shows the N-bound ethylacetate to lie out of central plane. The methyl group in effects electronic structure compared H congener. forms only a weak non-covalent contact packing. calculated lattice energy for derivative is 4.1 kcal/mol greater. Compound has moderate inhibition against ?-glucosidase. X-ray crystallography pyridazine (ethyl 2-(3-methyl-4-(4-methylbenzyl)-6-o...

A new sulphur glycoside, named descurainoside (1), and the known compound sinapic acid (2) have been isolated from the seeds of Descurainia sophia (L.) Webb ex Prantl. The structure of 1 has been identified as (1R,6S,8R,9S,10S)-9,10-dihydroxy-4-[(4-hydroxy-3,5-dimethoxyphenyl)methylene]-8-(hydroxymethyl)-2,7-dioxa-5-thiabicyclo[4.4.0]decan-3-one by means of physico-chemical properties and spect...

The objective of this study was to measure discolouration using a digital camera on various types of clear orthodontic elastic modules, immersion solutions, and time periods to determine whether the cause of discolouration of these modules was due to simple staining, chemical degradation, or both. Three types of clear orthodontic elastomeric modules were investigated [Plastic ligatures (AO); Po...

The cytotoxic chloroform fraction of Euphorbia aellenii afforded two cycloartane type triterpenes-cycloart-25-en-3β,24-diol (1) and 24-methylene-cycloartan-3β-ol (2)-for the first time from this plant. Preparation of cycloartane derivatives, 3β, 24-O-diacetyl-cycloart-25-en as compound 3 and 3β-O-acetyl-24-methylene-cycloartan (4) were conducted by acetylating of 1 and 2, respectively. The stru...

In this work, a series of novel benzyl sulfoxide 2-indolinone derivatives was designed and synthesized as potent anticancer agents. Tyrosine kinase inhibitory activity assay indicated that most of the compounds showed significant activity. The in vitro antiproliferative activity of these compounds was further investigated against five human cancer cell lines (HeLa, HepG2, MCF-7, SCC-15, and A54...

1-(2-Alkynylphenyl)ketoximes react with Lawesson's reagent catalyzed by InCl(3) and cyanuric chloride leading to 4-methylene-4H-benzo[d][1,3]thiazines in good yields. This tandem reaction proceeds with high efficiency through Beckmann rearrangement, thioamide formation, and intramolecular nucleophilic cyclization.

In our previous papers1»2), we described the structure-activity relationships of 6-(heterocyclyl)methylene penam sulfones (1) as a new class of /3-lactamase inhibitors and proposed a mechanism of enzyme inactivation for series 1. In continuation of these studies with series 1, we pursued the closely related structures in series 2, since they should follow a similar mechanistic pathway and shoul...

The genetic context, phylogeny, and biochemistry of a gene flanking the H(2)-forming methylene-H(4)-methanopterin dehydrogenase gene (hmdA), here designated hmdB, indicate that it is a new member of the radical S-adenosylmethionine enzyme superfamily. In contrast to the characteristic CX(3)CX(2)C or CX(2)CX(4)C motif defining this family, HmdB contains a unique CX(5)CX(2)C motif.