An effective BINAP and microwave accelerated palladium-catalyzed amination of 1-chloroisoquinolines in the synthesis of new 1,3-disubstituted isoquinolines

Synthesis of 11,12-dihydro benzo[c]phenanthridines via a Pd-catalyzed unusual construction of isocoumarin ring/FeCl3-mediated intramolecular arene-allyl cyclization: First identification of a benzo[c]phenanthridine based PDE4 inhibitor

In spite of their various pharmacological properties the anti-inflammatory potential of benzo[c]phenanthridines remained underexplored. Thus, for the first time PDE4 inhibitory potential of 11,12-dihydro benzo[c]phenanthridine/benzo[c]phenanthridine was assessed in vitro. Elegant synthesis of these compounds was performed via a multi-step sequence consisting of a Pd-catalyzed unusual construction of 4-allyl isocoumarin ring and FeCl₃-mediated intramolecular regio- as well as site-selective arene-allyl cyclization as key steps. The overall strategy involved Sonogashira coupling followed by isocoumarin and isoquinolone synthesis, then chlorination and subsequent cyclization to afford a range of 11,12-dihydro derivatives. One of these dihydro compounds was converted to the corresponding benzo[c]phenanthridine that showed concentration dependent inhibition of PDE4B affording an initial hit molecule. The SAR study suggested that 11,12-dihydro analogs were less potent than the compound having unsaturation at the same part of the ring.

A facile and practical copper diacetate mediated, ligand free C–N cross coupling of trivalent organobismuth compounds with amines and N-heteroarenes

In present work, an efficient Cu(OAc)₂·H₂O catalyzed protocol in the absence of any additional ligand has been developed for the N-arylation of amines and nitrogen containing heterocycles using trivalent organobismuth reagents under mild conditions.

Water mediated reactions: TiO2and ZnO nanoparticle catalyzed multi component domino reaction in the synthesis of tetrahydroacridinediones, acridindiones, xanthenones and xanthenes

Tetrahydroacridine-1,8-(2H,5H,9H,10H)-diones4from 1,3-cyclohexanedione and/or dimedone 1,2-chloro-3-formylquinoline2and anilines3in water at 90 °C were obtained by domino reaction approach.

Organoiodine(iii) mediated intramolecular oxidative cyclization of 1-(3-arylisoquinolin-1-yl)-2-(arylmethylene)hydrazines to 5-aryl-3-(aryl)-[1,2,4]triazolo[3,4-a] isoquinolines

Intramolecular C–N bond formation is achieved through oxidative cyclization of 1-(3-arylisoquinolin-1-yl)-2-(arylmethylene)hydrazines, 3, in the presence of hypervalent iodine oxidant and dichloromethane at ambient temperature.

Synthesis of methoxy-substituted chalcones and in vitro evaluation of their anticancer potential

Methoxy-substituted chalcones, 3 were obtained using simple, efficient method from 2-naphtylethanone, 1 and aromatic aldehydes, 2. The in vitro cytotoxicity activities of the chalcones against a panel of three human cancer cell lines were explored. The tested compounds were found to possess significant cytotoxic activity. The DNA strand break and damage was quantified through alkaline comet assay, flow cytometric analysis, and chromatin condensation studies, which revealed the apoptotic nature of the compounds. Compound 3c, (3-(3,4,5-trimethoxyphenyl)-1-(2-naphthyl) prop-2-en-1-one) showed highest cytotoxicity of 0.019 μm against HeLa, 0.020 μm against HCT15 and 0.022 μm against A549. Compound 3e, (3-(3,5-dimethoxyphenyl)-1-(2-naphthyl) prop-2-en-1-one) showed better IC50 values against all the three cell lines employed for the study.

Green chemical approach: microwave assisted, titanium dioxide nanoparticles catalyzed, convenient and efficient C–C bond formation in the synthesis of highly functionalized quinolines and quinolinones

TiO₂ nanoparticles was effectively applied in the microwave assisted synthesis of quinolines and quinolones.

A convenient and efficient C–OH bond activation, PdCl2(PPh3)2catalyzed, C–C bond formation of tautomerizable quinolinones with the aid of BOP reagent and boronic acids

C–C bond formation of tautomerizable quinolinones. C–OH bond activation using BOP reagent and boronic acids.

TiO2 nano crystallites catalyzed water mediated microwave assisted regioselective three component domino hydrolysis/aldol condensation/Michael addition reaction of 3-(1,5-dioxo-1,5-diphenylpentan-3-yl)quinolin-2(1H)-one

Microwave supported, water intervened, nano crystalline TiO₂ catalyzed synthesis of 3-(1,5-dioxo-1,5-diphenylpentan-3-yl)quinolin-2(1H)-ones, is described.