Process for preparing 4-aminomethyl-3-alkoxyiminopyrrolidine methanesulfonate

摘要

The present invention relates to a process for the preparation of 4-aminomethyl-3-alkoxyiminopyrrolidine methane-sulfonate, a key intermediate of quinolone antibiotics. According to the process of the present invention, the total number of steps has been shortened to 2-3 steps, the solid separation is not required, and the use of costly chemicals, particularly (BOC)₂O (t-butoxycarbonyl anhydride), several organic solvents and reactants, is eliminated.