Visible light mediated, an eco-friendlier synthetic protocol for dihydropyrano[2,3-c]pyrazoles via catalyst-free and solvent-free conditions at room temperature.
The catalyst-free oxidative cleavage of (Z)-triaryl-substituted alkenes bearing pyridyl motif with ambient air under irradiation of blue LED at room temperature has been developed. The reaction was facile and scalable,...
A green and efficient method for the synthesis of various triazolo[1,2-a]indazoletrione under mild conditions is reported, that making it a genuinely green protocol.
Nano-sized CdS was successfully prepared, fully characterized and applied as a highly efficient reusable photocatalyst for the condensation of tertiary amines with double and triple bonds via a C–H activation approach.
The synthesis of 3-(aryl(piperidin-1-yl)methyl)-4-hydroxyquinolin-2(1H)-one derivatives
via catalyst-free multicomponent reaction is described. The reaction of 4-hydroxyquinolin-2(1H)-one,
piperidine, and 4-chlorobenzaldehyde was carried out in different solvents and under solvent-free conditions
at room temperature. The best solvent in terms of the yield and reaction time was found to be
dichloromethane. Most substituted benzaldehydes reacted with 4-hydroxyquinolin-2(1H)-one and
piperidine to afford corresponding products in good-to-excellent yields. Aldehydes with electronwithdrawing
groups were more reactive to exhibit higher reaction rates. However, 2-substituted benzaldehydes
did not react with 4-hydroxyquinolin-2(1H)-one and piperidine under the reaction condition.
Aldehydes bearing a hydroxyl group failed to produce the corresponding products.