Metal-organic and covalent organic frameworks are porous materials characterized by outstanding thermal stability, high porosities and modular synthesis. Their repeating structures offer a great degree of control over pore sizes, dimensions and surface properties. Similarly precise engineering at the nanoscale is difficult to achieve with discrete molecules, since they rarely crystallize as por...

We report the first enantioselective addition of pyrazoles to 1,3-dienes. Secondary and tertiary allylic can be generated with excellent regioselectivity. Mechanistic studies support a pathway distinct from previous hydroaminations: Pd0-catalyzed ligand-to-ligand hydrogen transfer (LLHT). This hydroamination tolerates range functional groups advances field diene hydrofunctionalization.

Abstract: A facile, 1,3-dipolar cycloaddition of ethyl diazoacetate (EDA) with various activated olefins including Baylis-Hillman adducts, activated and simple alkynes to afford 3,5-disubstituted pyrazolines and pyrazoles respectively in moderate to good yields, in high regioselective manner in the presence of Indium chloride and/or DABCO is reported. All the reactions were carried out under no...

On account of the reported anticancer activity of pyrazoles and thiazolidin-4-ones, we have designed and synthesized a series of novel 3-phenyl-2-(3-aryl-1-phenyl-1H-pyrazol-4-yl)thiazolidin-4-ones and investigated their COX-1 and COX2 inhibition potential and also their in vitro cytotoxic activity by MTT assay. Amongst the tested compounds, the compound 3e was found to be most potent COX-2 inh...

A straightforward methodology for the regioselective synthesis of pyrazoles has been developed by a domino sequence based on photoclick cycloaddition followed photocatalyzed oxidative deformylation reaction. Distinguishing features this protocol include an unprecedented photoredox-catalyzed Norrish type fragmentation under green-light irradiation and use α,β-unsaturated aldehydes as synthetic e...