Synthesis of Substituted N-Formylaminomethylenediphosphonates and Their Derivatives
Contract grant sponsor: Russian Foundation for Basic Research.
Contract grant numbers: 14-03-00001 and 15-03-00002.
ABSTRACT
The convenient methods for the synthesis of new trimethylsilyl esters of aminomethylenediphosphonic acids are elaborated. The new substituted N-formylaminomethylenediphosphonates are obtained via the interaction of trimethylsilyl esters of methylenediphosphonic acids with a mixture of triethyl orthoformate and ethanol. Also boron trifluoride–diethyl etherate as an effective catalyst is used for the interaction of hydrochlorides of ethoxymethylene imines with diethyl trimethylsilyl phosphite. The corresponding aminomethylenediphosphonic acids are presented.