One-pot, three-component reaction of<i>N</i>-isocyanimino-triphenylphosphorane (Ph<sub>3</sub>PNNC), acenaphthoquinone, and an aromatic carboxylic acid in water
three-component reaction of various aromatic carboxylic acids, acenaphthoquinone, and N-isocyanimino-triphenylphosphorane (Ph3PNNC) at a reaction temperature of 20–26°C for 15 h. The remarkable features of this “green” methodology include high yield of products, water as the solvent, short reaction time, operational simplicity, environmentally benign, and the absence of any volatile or hazardous organic solvents
Synthesis of sterically congested 1,3,4-oxadiazole derivatives from aromatic carboxylic acids, acenaphthoquinone, and (N-isocyanimino)triphenylphosphorane
Reactions of (N-isocyanimino)triphenylphosphorane with acenaphthoquinone in the presence of aromatic carboxylic acids proceed smoothly at room temperature and under neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives in high yields. The reaction proceeds smoothly and cleanly under mild conditions and no side reactions are observed.