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Initial optimization of a series of novel imidazo[1,5-a]quinoxaline compounds originated from a heuristic approach combining two known structural moieties towards α5-GABA

Two-photon (TP) uncaging of neurotransmitter molecules is the method of choice to mimic and study the subtleties of neuronal communication either in the intact brain or in slice preparations. However, the currently available caged materials are just at the limit of their usability and have several drawbacks. The local and focal nature of their use may for example be jeopardized by a high spontaneous hydrolysis rate of the commercially available compounds with increased photochemical release rate. Here, using quantum chemical modelling we show the mechanisms of hydrolysis and two-photon activation, and synthesized more effective caged compounds. Furthermore, we have developed a new enzymatic elimination method removing neurotransmitters inadvertently escaping from their compound during experiment. This method, usable both in one and two-photon experiments, allows for the use of materials with an increased rate of photochemical release. The efficiency of the new compound and the enzymatic method and of the new compound are demonstrated in neurophysiological experiments.

A simple solvent-free heterogeneous catalytic method was developed for the synthesis of substituted quinoline derivatives via the Friedlander cyclization.

A new Pd/MgLa mixed oxide and the known Pd/MgAl hydrotalcite catalysts were applied and recycled successfully in catalytic transfer hydrogenation reactions in ionic liquids. Some α,β‐unsaturated carboxylic acid derivatives were hydrogenated in excellent yields. The catalysts were recycled without significant loss of activity. Besides that, a number of halogenated aromatic compounds were dehalogenated under similar catalytic transfer conditions.

A simple and environmentally friendly synthesis of substituted benzimidazoles was developed using a small‐pore‐size zeolite. The similar reaction was not applicable to the preparation of 2‐substituted imidazolines.

The modified small pore size zeolite E4a has been found to be an efficient catalyst for the regioselective synthesis of 2,3-dihydro-1H-1,5-benzodiazepines from o-phenylenediamine and ketones. This method is simple, cheap, environmentally-friendly and give the benzodiazepines in high yield.

A new, environmentally-friendly synthesis of dihydroquinolines from aniline and ketones using a small pore size zeolite as catalyst is described. This method is simple, cheap and gives the dihydroquinolines in high yield.

A new, environmentally-friendly variation of the Bischler–Napieralski reaction was developed using a small pore size zeolite. This method is simple, cheap and gives the dihydroisoquinolines in high yield.

A new Pd/MgLa mixed oxide and the known Pd/MgAl hydrotalcite catalysts were applied and recycled successfully in catalytic transfer hydrogenation reactions in ionic liquids. Some α,β‐unsaturated carboxylic acid derivatives were hydrogenated in excellent yields. The catalysts were recycled without significant loss of activity. Besides that, a number of halogenated aromatic compounds were dehalogenated under similar catalytic transfer conditions.