1021940-44-2Relevant academic research and scientific papers
Synthesis, characterization and application of nitrogen–sulfur-doped carbon spheres as an efficient catalyst for the preparation of novel α-aminophosphonates
Taheri-Torbati, Mina,Eshghi, Hossein,Rounaghi, Seyyed Amin,Shiri, Ali,Mirzaei, Mahdi
, p. 1971 - 1982 (2017)
Abstract: Nitrogen–sulfur-doped carbon spheres (NS-CSs) 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 α-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?°C under solvent-free conditions in high yield.
One-pot synthesis of α-aminophosphonates catalyzed by antimony trichloride adsorbed on alumina
Ambica,Kumar, Satish,Taneja, Subhash C.,Hundal, Maninder S.,Kapoor, Kamal K.
, p. 2208 - 2212 (2008/09/18)
SbCl3 adsorbed on Al2O3 is found to be an efficient and recyclable catalyst in promoting three-component coupling reactions of aldehydes (aromatic and aliphatic), amines (aryl amines, aliphatic amines and esters of S-α-amino acids) and dialkylphosphites to afford the corresponding α-aminophosphonates in high yields. The ethyl ester of S-phenylalanine was observed to yield the corresponding α-aminophosphonate with S,S-diastereoisomer formed in dominance over the S,R-diastereoisomer.
