ORGANOPHOSPHORUS COMPOUNDS AS POTENTIAL FUNGICIDES. PART VI.1PREPARATION, CHARACTERIZATION, AND BIOLOGICAL ACTIVITY OF ANALOGUES AND DERIVATIVES OF 1-AMINOPROPANEPHOSPHONIC ACID

A greener procedure for the synthesis of α-ureidophosphonates under ultrasound irradiation. An X-ray crystallographic study

The synthesis of α-ureidophosphonates via a one-pot three-component reaction using ultrasonic irradiation under solvent- and catalyst-free conditions at 75° is developed. The products were obtained in excellent yields within short reaction times.

Synthesis and inhibitory activity of ureidophosphonates, against acetylcholinesterase: pharmacological assay and molecular modeling

A novel method has been developed for the synthesis of 1-ureidophosphonates through a three components condensation of aldehyde with amine and diethylphosphite in the presence of sulfanilic acid as catalyst followed by subsequent reaction of the product with isocyanate. This method is easy, rapid, and good yielding. The anticholinesterase (AChE) activities (inhibition potency through IC(50)) of newly synthesized 1-ureidophosphonates were also investigated. The activities of the synthesized compounds toward the enzyme AChE were determined and compared in terms of their molecular structures and it was found, through molecular docking simulations, that the most potent derivative (compound 3i) inhibited the enzyme through binding to the peripheral anionic site (PAS) and not to its acylation site (A site).

A Novel Method for the Separation of Bis(α-hydroxyalkyl)phosphinic Acid Diastereoisomers via Formation of Novel Cyclic Phosphinic Acids

The reaction of aromatic and aliphatic aldehydes with hypophosphorus acid under microwave irradiation was examined. The reaction gave a mixture of a racemic pair of bis(alpha-hydroxyalkyl)phosphinic acids and acetal derivatives from the corresponding bis(alpha-hydroxyalkyl)phosphinic acids of meso-stereochemistry in good yield. The difference in solubility in organic solvents due to polarity allowed us to readily separate these compounds. This method constitutes an easy, rapid, and good-yielding preparation and separation of bis(alpha-hydroxyalkyl) phosphinic acid diastereoisomers from simple starting materials using microwave irradiation.