In the work presented here, we aimed at the development of a green, general protocol for the SNAr displacement of halogen atoms by amines in p-deficient heterocyclic substrates, exemplified by acridine, quinoline and quinazoline, leading to pharmacologically relevant products. As an energy source, we chose focused microwave irradiation, which is able to heat the reactants without the need to heat the entire furnace or oil bath, leading to decreased reaction times and energy
savings. Thus, in a recent report where energy use was determined experimentally by using a watt-meter, a reaction leading to naphtho[2,3-b]furan-4,9-diones was found to be ca. eight times more energy-efficient under focused microwave
irradiation than under conventional heating.15 Microwave irradiation is becoming an increasingly popular tool for high-throughput synthesis since it allows the assembly of compound libraries in a fraction of the time required by conventional protocols, in the context of both batch and flow chemistries.