A highly diastereoselective Diels–Alder reaction between cyclopentadiene and ethyl (Z)-2-N-Boc-amino-3-nitroacrylate in neat conditions affords the ethyl 2-t-butoxycarbonylamino-3-endo-nitro-bicyclo[2.2.1]hept-5-ene-2-exo-carboxylate: a new constrained carbocyclic amino acid. Catalytic hydrogen...

A series of oxazolo[4,5-g]quinazolin-2(1H)-one derivatives employing Erlotinib as lead compound were synthesized and evaluated for their EGFR inhibition activity. These compounds having variation at the 1 and 8-position, included ether and esters hydrophilic side-chain and aromatic head fragment...

A simple and novel synthesis of polytrisubstituted-2-pyridones derivatives by the reaction of enamino esters and diethyl ethoxymethylenemalonate has been reported. The method provides a rapid synthetic route for the construction of 2-pyridones under catalyst- and solvent-free reaction conditions...

The 2-aminothiazole (2-AT) core is an active pharmacophore and used in medicinal chemistry and drug discovery research. A number of drugs with 2-AT core are in the market, e.g. Famotidine, Cefdinir, Meloxcam etc. Recently, 2-AT core has been explored for many more important therapeutic areas and...

A more efficient preparation of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-7-fluoro-6-methoxy-3-quinolinecarbonitrile (2), the penultimate intermediate in the synthesis of bosutinib (1a), was developed. New 7-alkoxy-4-phenylamino-3-quinolinecarbonitrile Src inhibitors were prepared from 5 and 9, th...

An efficient convenient procedure for the synthesis of 3-aryl-2-oxazolidinones from 2-(arylamino) alcohols and diethyl carbonate (DEC) catalyzed by ionic liquids is described. The effects of reaction time, amount of catalyst and temperature were investigated. Excellent yields of products were ob...

Vitamin B12 was applied as catalyst for the one-pot three-component synthesis of 3,4,5-trisubstituted furan-2(5H)-ones from the condensation between aldehydes, amines and dialkylacetylendicarboxylates at ambient temperature in EtOH. In addition, N-aryl-3-aminodihydropyrrol-2-one-4-carboxylates w...

New 4-phenylamino-3-quinolinecarbonitriles with a 7-ethynyl group substituted by a pyridine, phenyl or thiophene ring containing basic water solubilizing groups were prepared and evaluated as Src kinase inhibitors. Of these new analogs, potent activity was observed with compounds having a (2,4-d...

Ozonation of 11 naphthalene sulfonic acids (NSA) in the aqueous solution was studied by bubbling at 31°C at an ozone dose rate of 5.56 mg min−1 l−1. COD, TOC and BOD5 of these compounds were tested. It was found that COD and TOC can be removed effectively by ozonation as expected. More than 40%...

The synthesis of new tridental 2,4-bis(1-hydroxycyclopentyl)azetidines using (S)-1-phenylethylamine as starting material is described. These new structures have been successfully applied in the enantiocontrolled catalytic addition of diethylzinc to aromatic aldehydes reaching enantiomeric excess...

A series of benzene sulfonamides incorporating 1,3,5-triazinyl moieties were synthesized using cyanuric chloride as starting material. Inhibition studies against human carbonic anhydrase (hCA, EC 4.2.1.1) isoforms I, II (cytosolic) and IX, XII (transmembrane, tumor-associated) isoforms were perf...

Regioselective, simple and fast synthesis of a series of [2 + 3]-cycloaddition products, 2-11, 4-(4-RC2HN3)C6F4CO2Et (2: R = Ph; 3: R = CMe2OH; 4: R = CH2OH; 5: R = CO2Et; 6: R = n-C5H11; 7: R = CH2O-o-C6H4CHO; 8: R = CH2O-p-C6H4NHBoc; 9: R = CH2O-p-C6H4CH2OH; 10: R = CH2O2CC6F5; 11: R = p-C6H4B...

Two new copolymers based on 4-(1-hydroxy-1-methylethyl)styrene and styrene or 4-hydroxystyrene have been designed and prepared for use as ultrahigh resolution resist materials in microlithography. The tertiary benzylic alcohol moieties contained in these copolymers undergo acid-catalysed dehydra...

The metabolism of 7,12-dimethylbenz[a]anthracene (DMBA) and its non-carcinogenic 2-fluoro analogue (2F-DMBA) by Syrian hamster embyro (SHE) cells has been studied using high pressure liquid chromatography (HPLC) and fluorescence spectroscopy. Metabolites produced by SHE cells were compared chrom...

Exceptional tumorigenic potency was observed with 4-fluorobenzo[j]fuoranthene (4-fluoroB[j]F) relative to benzo[j]fluoranthene (B[j]F) and 10-fluorobenzo[j]fluoranthene (10-fluoroB[j]F) in a mouse skin initiation promotion bioassay. Comparison of the tumorigenic response obtained at total initia...

3,6-Dimethylcholanthrene (3,6-DMC) and 7,11,12-trimethylbenz[a]anthrene (7,11,12-TMBA) were tested for tumor-initiating activity on mouse skin as an approach to evaluate the potential role of steric strain in the bay-region on tumorigenic potency. Methyl-substitution at the 6-position of 3-methy...

The influence of β-carotene on the formation of DNA-adducts induced by 7,12-dimethylbenz(a)anthracene (DMBA) and 7-hydroxymethyl-12-methylbenz(a)anthracene (7-OHM-12-MBA) during transformation of mouse mammary cells in organ culture was analysed. Treatment with β-carotene (10−8–10−5 mol/l) ca...

The binding of 7,12-dimethylbenz[a]anthracene (DMBA) to DNA was examined in Syrian hamster and Wistar rat embryo cell cultures exposed to DMBA for 5, 24, 48 and 72 h. The level of binding of DMBA to DNA was about twice as great in the hamster embryo cells as in the rat embryo cells at all times....

A novel bromine-containing alkaloid, dibromoisophakellin hydrochloride, has been isolated from marine sponge Acanthella carteri. The structure of this compound has been determined on the basis of the spectroscopic data and X-ray analysis.

A short synthesis of the marine sponge alkaloids dibromophakellstatin (1) and dibromoisophakellin (2) is described. The synthesis of 1 centers on a putative biomimetic oxidative cyclization of imidazolone 5. Thermal rearrangement of dibromophakellin (9) in the presence of K2CO3 afforded dibromoi...