Two Simple Methods for the Synthesis of Trialkyl ?-Aminophosphono-Acetates ( 3 ). Trifluoromethanesulfonyl Azide as an Azide-Transfer Agent

Abstract
In connection with a cephalosporin synthesis,1 Ratcliffe and Christensen reported the preparation of alkyl α-aminodiethylphos-phonoacetate2 3. We experienced considerable difficulty in repeating the procedure reported, and wish to describe alternate simple, high-yield preparations of 3.