Unusual tandem ring closing metathesis–Claisen rearrangement enroute to spiro annulation of O-allyl biscoumarins

Biscoumarin derivative for designing the WLED display applications

“…The coumarins and their derivatives were privileged oxygen heterocyclic compounds occurred in several natural products. Among various derivatives of coumarins, bis-coumarins have drawn much importance since they are well known to possess distinct pharmacological and biological properties viz., antifungal, anti-HIV, antibiotic, antiviral, antibacterial, anticoagulant, anticlotting and anticancer and also proved several applications in different fields [1]. Further, the novel biscoumarin derivatives has fascinated the scientific community due to the interesting applications of synthesized compounds (bis) such as red and green OLEDs have met the requirements for practical applications [2].…”

“…The literature revealed that, the different kinds of methods have been developed for the synthesis of biologically and spectroscopically active biscoumarin derivatives, specially the catalytic method. Therefore, we attempted to synthesis 4-Hydroxy-3-[(4-hydroxy-2-oxo-2H-chromen-3-yl) (4-methoxyphenyl) methyl]-2H-chromen-2-one (4-HCMC) dye using acetic acid as a catalyst [1][2]. Furthermore, the electronic spectra of 4-HCMC derivative in solutions depending on the solvents parameters they showed excellent fluorescence properties.…”

Synthesis and Antibacterial Activity of New Spiro[thiadiazoline-(pyrazolo[3,4-d]pyrimidine)] Derivatives

“…In light of the great importance of spirocyclic systems containing one carbon atom common to two rings [11][12][13], in recent years efforts have been made in developing methodologies for the synthesis of these compounds especially by cycloaddition reactions [14][15][16][17][18][19][20][21][22].…”