rac-BINAP-PdCl2 catalyzed Heck reactions of 3-formylquinolin-2-yl chlorides with methyl acrylate: synthesis of methyl 3-(3-formylquinolin-2-yl) acrylates

Synthesis of Viriditins A and B by Selective Coupling of Trans-1,2-Dichloroethylene

A synthesis of (-)-viriditin A and (-)-viriditin B has been completed sequentially using a Suzuki coupling and a Heck reaction of trans-1,2-dichloroethylene. The selectivity for monocoupling of trans-1,2-dichloroethylene is attributed to a lower-energy transition state for the oxidative addition step.

Improving the Efficacy of Quinolylnitrones for Ischemic Stroke Therapy, QN4 and QN15 as New Neuroprotective Agents after Oxygen-Glucose Deprivation/Reoxygenation-Induced Neuronal Injury

In our search for new neuroprotective agents for stroke therapy to improve the pharmacological profile of the compound quinolylnitrone QN23, we have prepared and studied sixteen new, related and easily available quinolylnitrones. As a result, we have identified compounds QN4 and QN15 as promising candidates showing high neuroprotection power in a cellular experimental model of ischemia. Even though they were found to be less active than our current lead compound QN23, QN4 and QN15 provide an improved potency and, particularly for QN4, an expanded range of tolerability and improved solubility compared to the parent compound. A computational DFT-based analysis has been carried out to understand the antioxidant power of quinolylnitrones QN23, QN4 and QN15. Altogether, these results show that subtle, simple modifications of the quinolylnitrone scaffold are tolerated, providing high neuroprotective activity and optimization of the pharmacological potency required for an improved design and future drug developments in the field.

Metal-free POCl3 promoted stereoselective hydrochlorination of ethynylated azaheterocycles

An efficient stereoselective hydrochlorination of ethynylated azaheterocycles was achieved using POCl₃ as a chlorinating agent under metal-free reaction conditions.

PVA/Fe(NO3)3 nanofiber mats: an efficient, heterogeneous and recyclable catalyst for the synthesis of quinolines via Friedländer annulations

PVA/Fe(NO₃)₃ nanofiber mats are found to be a heterogeneous recyclable catalyst for the efficient synthesis of quinoline derivatives in the Friedländer condensation of 2-aminoarylketones with carbonyl compounds and β-keto esters.