Ultrasonics in isocyanide-based multicomponent reactions: A new, efficient and fast method for the synthesis of fully substituted 1,3,4-oxadiazole derivatives under ultrasound irradiation
作者:Morteza Rouhani、Ali Ramazani、Sang Woo Joo
DOI:10.1016/j.ultsonch.2014.06.017
日期:2015.1
and convenient approach to the synthesis of fully substituted 1,3,4-oxadiazoles via three-component reaction of aromatic carboxylic acids, acenaphthoquinone, and (N-isocyanimino)triphenylphosphorane under ultrasound irradiation is described. Furthermore, a series of compounds were synthesized and characterized by melting point, IR, NMR and MS. Utilization of easy reaction conditions, very high to excellent
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.
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