Environment dependent photophysical and fluorescence turn-off sensing properties of Fe(iii) by substituted phenyl isochromenopyrrol-5-ones

The proposed isochromenopyrrolones can serve as highly selective and sensitive sensors for iron(iii) in pharmaceutical, industrial and biological applications.

Synthesis of substituted 2H-chromenes by a three-component reaction as potential antioxidants

A series of alkoxy-substituted 2H-chromenes were synthesized by a one-pot three-component reaction using salicylaldehydes, acetyl acetone and alcohol as reactant and medium with tetra-n-butylammonium fluoride (TBAF) as catalyst. Simple reaction conditions, short reaction time and overall good yield of products make this synthetic strategy an efficient one to synthesize 2H-chromene molecules. All the synthesized compounds were evaluated for antioxidant activities. Among all the new compounds, 5j and 5k showed good inhibition [Formula: see text] and [Formula: see text]) at 100 [Formula: see text] concentrations.

Unexpected regiospecific Michael addition product: synthesis of 5,6-dihydrobenzo[1,7]phenanthrolines

The unexpected formation of 5,6-dihydrobenzo[1,7]phenanthroline instead of 5,6-dihydrobenzo[1,7]phenanthroline-3-carbonitrile in acridine molecules using Michael addition has been observed for the first time.

Iodine-mediated synthesis of indazolo-quinazolinones via a multi-component reaction

We report an expeditious synthesis of selected indazolo-quinazolinone derivatives via an iodine-mediated multi-component reaction (MCR).