Synthesis of functionalized organophosphorus derivatives of succinic acid

Convenient synthesis of phosphorus-containing derivatives of succinic acid, which contain functionalized phosphonous, phosphonic, and phosphinic acid moieties have been developed. The nucleophilic addition of bis(trimethylsiloxy)phosphine to diesters of maleic, itaconic, and acetylenedicarboxylic acids proceeds regioselectively to give a number of functionalized phosphonites. Further aminomethylation of these compounds affords various target acid derivatives. The resulting compounds are of interest as promising biologically active substances and water-soluble ligands.