An efficient and selective route to hybrid trifluoromethyl-substituted γ-lactones or fused nitrogen derivatives via cascade reactions

Tungsten catalysed decarboxylative [3 + 2] cycloaddition aromatization: one-pot synthesis of trifluoromethyl-pyrrolo[2,1-a]isoquinolines with visible light irradiation

Trifluoromethyl-pyrrolo[2,1-a]isoquinolines, which are difficult to prepare via traditional methods, could be readily prepared via a tungsten-catalysed decarboxylative [3 + 2] cycloaddition aromatization process.

[3 + n] Cycloaddition Reactions: A Milestone Approach for Elaborating Pyridazine of Potential Interest in Medicinal Chemistry and Optoelectronics

During the last few decades, pyridazine derivatives have emerged as privileged structures in heterocyclic chemistry, both because of their excellent chemistry and because of their potential applications in medicinal chemistry and optoelectronics. This review is focused on the recent advances in [3 + n] cycloaddition reactions in the pyridazine series as well as their medicinal chemistry and optoelectronic applications over the last ten years. The stereochemistry and regiochemistry of the cycloaddition reactions are discussed. Applications in optoelectronics (in particular, as fluorescent materials and sensors) and medicinal chemistry (in particular, antimicrobials and anticancer) are also reviewed.

New pyridazine-fluorine derivatives: synthesis, chemistry and biological activity. Part II

A comprehensive study concerning synthesis, structure and biological activity of new pyridazine-fluorine (PYF) derivatives is presented. The first synthesis of PYF derivatives in phase-transfer catalysis (PTC) under microwave (MW) and conventional thermal heating (TH) is reported. Under MW irradiation the consumed energy decreases considerably, the amount of used solvent in liquid phase is at least five-fold less comparative with conventional TH, while PTC did not use solvents. Consequently these reactions could be considered environmentally friendly. Also, the reaction time decrease substantially and, in some cases, the yields are higher. A feasible explanation for MW efficiency is presented. Regiochemistry and chorochemistry involved in these reactions are also discussed; the reactions are regioselective and chorospecific or choroselective, respectively. Ten new pyridazine-fluorine cycloadducts are obtained. The in vitro antibacterial and antifungal activities of the PYF compounds were tested. Introduction of a trifluoromethyl moiety on the pyridazine skeleton is leading to an increasing of the antimicrobial activity. Structure-activity correlationships have been done.