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Results for “Imides”

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At least 145 records · Page 8Linked to original sources
PubMed1980

Synthesis and mode(s) of action of a new series of imide derivatives of 3-nitro-1,8 naphthalic acid.

Four new imide derivatives of 3-nitro-1,8-naphthalic acid have been synthesised. The compounds show strong cytostatic activity against both HeLa and KB cells and are moderately toxic towards both mice and rats (LD50 above 4 mg/kg IP). Two of the most active compounds, M-4212 and M-12210, prevented the development of mouse Ehrlich ascites and rat Yoshida carcinoma. All these drugs block cell growth by inhibiting the synthesis of both DNA and RNA. In particular, both M-4212 and M-12210 raise the melting point of double-stranded DNA.

Animals↗
PubMed1990

15N nuclear magnetic resonance studies of the B domain of staphylococcal protein A: sequence specific assignments of the imide 15N resonances of the proline residues and the interaction with human immunoglobulin G.

15N nuclear magnetic resonance (NMR) studies of the B domain (FB) of Staphylococcus protein A, which is uniformly labeled with 15N, are reported. The alpha CH(i)-15N(i) connectivity in the 1H-15N HMBC spectrum and the 13C(i-1)-15N(i) spin coupling in the 15N spectrum of a 13C-, 15N-doubly labeled FB were used to establish the assignments of the imide 15N resonances for all three Pro residues that exist in FB. Addition of human IgG caused a significant downfield shift of the Pro-39 resonance. This result is quite consistent with our previous suggestion that a significant conformation change is induced in the Ser-42-Ala-55 helical region of FB when it is bound to human IgG.

Binding Sites↗
PubMed1990

Substituted cyclic imides as potential anti-gout agents.

N-substituted cyclic imides of phthalimide, 2,3-dihydrohalazine-1,4-dione, and diphenimide were shown to reduce the serum uric acid levels in normal and hyperuric mice at 20 mg/kg/day I.P. for 14 days. The agents were potent inhibitors of commercial xanthine dehydrogenase and xanthine oxidase enzyme activities with IC50 values from 10(-7) to 10(-8) M concentrations of drug.

Allopurinol↗
PubMed2004

N-acyl substituted 7-amino-4-chloroisocoumarin: a peptide degradation model via an imide mechanism.

During the coupling reaction between 3-alkoxy-7-amino-4-chloroisocoumarin and N-acyl alanine dipeptide, an unexpected deamidation reaction was observed. The proposed mechanism for this reaction involved the formation of an imide intermediate which after cleavage led to the release of amino acid moiety. The described deamidation reaction represents the first chemical model involving a non-peptidic moiety, which mimics biological and chemical deamidation processes occurring in proteins or peptides incorporating an asparagine or a glutamine residue.

Coumarins↗
PubMed2005

Novel approach to pro-drugs of lactones: water soluble imidate and ortho-ester derivatives of a furanone-based COX-2 selective inhibitor.

Interest in water soluble COX-2 inhibitors that can be administered intravenously led to the development of novel pro-drugs of a furanone based COX-2 inhibitor 2. Transforming the lactone moiety of the furanone to an imidate or an ortho-ester with a hydrophilic, endogenous appendage resulted in water soluble pro-drugs that converted to the parent drug in vivo.

Cyclooxygenase 2↗
PubMed2006

Synthesis, hydrolyses and dermal delivery of N-alkyl-N-alkyloxycarbonylaminomethyl (NANAOCAM) derivatives of phenol, imide and thiol containing drugs.

Synthesis, characterization and hydrolysis in aqueous buffers of novel N-alkyl-N-alkyloxycarbonylaminomethyl (NANAOCAM) derivatives of substituted phenols, theophylline (Th) and 6-mercaptopurine (6MP) were carried out. The mechanism of hydrolysis was further investigated by synthesis, characterization and hydrolysis of N-aryl-N-alkyloxycarbonylaminomethyl (NArNAOCAM) derivatives of phenols. The hydrolysis follows pseudounimolecular first order kinetics and operates by way of an S(N)1-type mechanism. Topical delivery of selected derivatives of acetaminophen (APAP), Th and 6MP was examined in in vitro diffusion cell experiments from IPM across hairless mice skins. The prodrug of APAP and 6MP increased permeation across the skin by about 2- and 4-fold, respectively, compared to the parent drug. NANAOCAM promoieties can act as novel prodrug derivatives of phenol, imide and thiol containing drugs for enhancing topical absorption.

Administration, Cutaneous↗
PubMed2005

Synthesis and cytotoxicities of 7-aza rebeccamycin analogues bearing various substituents on the sugar moiety, on the imide nitrogen and on the carbazole framework.

The synthesis of a family of rebeccamycin analogues in which one indole unit has been replaced by a 7-azaindole moiety is described. Substitutions have been carried out on the imide nitrogen, on the carbazole framework and on the sugar part. Compounds with a lactam upper heterocycle have also been prepared. The cytotoxicities of the newly synthesized compounds toward four tumor cell lines, one murine leukemia (L1210) and three human tumor cell lines (prostate carcinoma DU145, colon carcinoma HT29, and non-small cell lung carcinoma A549) have been evaluated and compared to those of rebeccamycin and parent non-aza and aza compounds.

Animals↗
PubMed2005

Synthesis and study of some new N-substituted imide derivatives as potential anticancer agents.

A new series of N-substituted imide derivatives have been synthesized by treating phthalic anhydride, naphthalic anhydride and their substituted derivatives with 2-hydrazino-1-imidazoline hydrobromide, various para-substituted aryl amines, aminoglutethimide and 2,4-dinitrophenyl hydrazine. Compounds 9, 10, 12, 18, 19, 23, 24 and 34-36 have been selected and screened for antineoplastic activity by National Cancer Institute, Bethesda, USA. Some newer aminoglutethimide derivatives 37-39 have also been prepared in order to study the effect of N-substitution on its pharmacological profile for the treatment of carcinoma. These compounds (37-39) have exhibited weak inhibition of human placental aromatase as compared to aminoglutethimide.

Animals↗
PubMed2004

Synthesis and surface properties of aqueous dispersions of poly(ester-imide) prepared from anhydride terminated polyester prepolymer and diisocyanate.

Aqueous dispersions of poly(ester-imide)s [P(E-I)s] have been prepared by dispersing the P(E-I)s in water without any external solubilizing agents. P(E-I)s were prepared from anhydride-terminated polyester prepolymer and diisocyanate. The -COOH groups in the polymer were then neutralized using triethylamine and the P(E-I)s were subsequently dispersed in water. The influence of the degree of ionization of polymers on the particle size and viscosity of the dispersion has been studied. The dispersions were crosslinked using polyaziridine. The crosslinked dispersion cast films were characterized for dynamic mechanical properties. As the ionic content increased the particle size decreased and the viscosity increased. When the amount of crosslinker added was varied, for a fixed percentage of ionization, the glass transition temperature Tg shifted to higher values. Critical surface tension (CST) measurements indicated reorganization of hydrophobic groups on the surface after crosslinking.

Cyanates↗
PubMed1998

Further studies on analgesic activity of cyclic imides.

As part of our research programme to obtain pharmacologically active compounds structurally related to cyclic imides, we have synthesized different compounds and examined their analgesic activities using the abdominal constriction test in mice. The results showed that some of the compounds studied, given intraperitoneally, exhibited graded and significant analgesia against acetic acid-induced abdominal constriction, being several times more potent than aspirin and paracetamol, two standard drugs used for comparison.

Analgesics↗
PubMed1998

Physicochemical factors for cytotoxic activity in platinum dinuclear complexes with pyrimidine and imide ligands.

The relationship between cytotoxic activity of platinum dinuclear complexes toward cancer cells and their intrinsic properties (electrophilicity and hydrophobicity) have been examined. It is shown that the reactivity with chloride anion is a good index of the electrophilicity of the platinum complexes. By assuming a cell kill pharmacodynamic model, the relation between IC50 value and the electrophilicity is obtained. It is concluded that inside cells the reactivity of the platinum complexes having imide ligands is higher than that of CDDP. The other important factor which affects the cytotoxic activity is hydrophobicity. The log k' values (k': capacity factor) are found useful to estimate the hydrophobicity of platinum complexes. The accumulation of platinum into cells is dominated by the hydrophobicity and the charge of platinum complexes. Highly hydrophobic complexes are thought to be adsorbed in cell membranes, resulting in low cytotoxic activity since they cannot reach DNA. A schematic model of the interaction between platinum complexes and serum proteins reveals that more hydrophobic complexes tend to bind to serum proteins more stably. At least three possible paths of the cellular platinum accumulation are suggested: direct accumulation of the platinum complexes, incorporation in the form of CDDP produced from the complexes, and incorporation through protein-platinum complexes, although the contribution of the third one may be small.

Animals↗
PubMed2001

Synthesis of antitumor dendritic imides.

Dendritic imides were synthesized and evaluated as antitumor compounds. Compounds 8 and 11 showing a promising profile as inhibitors of lck but their antiproliferative activity against HT-29 was not so relevant.

Antineoplastic Agents↗
PubMedDate not supplied

Solid-phase synthesis of cyclic imides.

A cyclative cleavage strategy for the synthesis of cyclic imides on a polystyrene resin is described. After optimization of the cleavage conditions, a small array of succinimides and phthalimides was synthesized. The methodology was then applied to a drug discovery project, in which it was used to synthesize a new class of delta-opioid receptor ligand by both automated and manual methods.

Combinatorial Chemistry Techniques↗
PubMed2003

Highly enantioselective, catalytic conjugate addition of cyanide to alpha,beta-unsaturated imides.

(Salen)Al-Cl complex 1a catalyzes the asymmetric conjugate addition of hydrogen cyanide to alpha,beta-unsaturated imides in high yields and enantioselectivities. The cyanide adducts can readily be converted into a variety of useful chiral building blocks, including alpha-substituted-beta-amino acids and beta-substituted-gamma-aminobutyric acids. Mechanistic data obtained thus far point to a cooperative bimetallic mechanism for nucleophile and electrophile activation.

Alkenes↗
PubMed2003

Enantioselective Michael additions to alpha,beta-unsaturated imides catalyzed by a Salen-Al complex.

(Salen)aluminum complex 1b is an efficient catalyst for the conjugate addition of di- and trisubstituted nitriles to a wide range of acyclic alkyl- and aryl-substituted alpha,beta-unsaturated imides. This new methodology provides access to multifunctional compounds that previously have not been readily accessible in enantioenriched form. Synthetic applications of these products include the preparation of enantiomerically enriched piperidines, as exemplified by an expedient asymmetric catalytic synthesis of (-)-paroxetine.

Aluminum↗
PubMed2004

Enantioselective formal hydration of alpha,beta-unsaturated imides by Al-catalyzed conjugate addition of oxime nucleophiles.

The (salen)Al-catalyzed asymmetric conjugate addition of salicylaldoxime to alpha,beta-unsaturated imides is the key step in an efficient and highly enantioselective two-step formal hydration of these electron-deficient olefins. This reaction constitutes the first example of an enantioselective conjugate addition of an oxygen-centered nucleophile to alpha,beta-unsaturated carboxylic acid derivatives. Application of this method to chiral, nonracemic substrates revealed a high level of catalyst-induced diastereoselectivity, underscoring its potential utility for polyketide natural product synthesis.

Alcohols↗
PubMed2006

Synthesis and hydrogenation of bis(imino)pyridine iron imides.

Treatment of the iron bis(dinitrogen) complex, (iPrPDI)Fe(N2)2 (iPrPDI = (2,6-iPr2C6H3N=CMe)2C5H3N), with a series of aryl azides resulted in loss of 3 equiv of N2 and formation of the corresponding four-coordinate iron imide compounds, (iPrPDI)Fe(NAr). These complexes, two of which (Ar = 2,6-iPr2-C6H3 and 2,4,6-Me3-C6H2) have been characterized by X-ray diffraction, are significantly distorted from planarity. The metrical parameters in combination with Mössbauer spectroscopic and SQUID magnetic data suggest an intermediate spin iron(III) center antiferromagnetically coupled to a ligand-centered radical. Nitrene group transfer has been accomplished by addition of 1 atm of CO, yielding aryl isocyanates, ArNCO, and (iPrPDI)Fe(CO)2. Hydrogenation of the more sterically hindered members of the series furnished free aniline and the previously reported iron dihydrogen complex. Catalytic aryl azide hydrogenation has also been achieved, and the observed relative rates are consistent with N-H bond formation as the rate-determining step in aniline formation.

Hydrogen↗