Ultrasound-assisted phase-transfer catalysis method in an aqueous medium to promote the Knoevenagel reaction: Advantages over the conventional and microwave-assisted solvent-free/catalyst-free method
catalyst-free conditions. The effects of conditions on reaction parameters were evaluated and compared in terms of reaction time, yield, purity and outcomes. The US-PTC method is more efficient than the MWI and conventional methods. The reaction times were considerably shorter, with high yields (>90%) and good levels of purity. In addition, X-ray diffraction analysis and quantum mechanical calculations
A one-step synthesis of novel functionalized 3,4-dihydro-2H-pyrroles from 2-isocyanoacetates and readily synthesized acrylonitriles is reported. The reaction proceeds smoothly under mild conditions with high efficiency. The structures of two representative structures, 3a and 3m, were confirmed by X-ray crystallographic analysis.