Synthesis, characterization and application of nitrogen-sulfur-doped carbon spheres as an efficient catalyst for the preparation of novel alpha-aminophosphonates

摘要

Nitrogen-sulfur-doped carbon spheres (NSCSs) were prepared from sucrose and thiourea through a simple hydrothermal process. NS-CSs were characterized by TEM, FTIR, TGA, XRD, Raman spectroscopy and elemental analyses. The results revealed that the synthesized carbon spheres have an amorphous structure with diameters of 300-500 nm. The microspherical carbon catalyst that is recyclable has been used in the synthesis of alpha-aminophosphonates derived from 2-aminobenzothiazoles. Three-component reaction was performed between 2-aminobenzothiazoles, aromatic aldehydes and trimethyl phosphite in the presence of NS-CSs as microorganocatalyst at 50 degrees C under solvent-free conditions in high yield.