New process for preparing...

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 471/04 (2006.01) C07D 207/22 (2006.01)

Patent

CA 2518081

The present invention relates to a process for the preparation of 4- aminomethyl-3-alkoxyiminopyrrolidine methanesulfonate, 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.

La présente invention concerne un procédé destiné à la préparation de 4-aminométhyl-3-alcoxyiminopyrrolidine méthanesulphonate, qui un intermédiaire clé des antibiotiques à base de quinolone. Dans le procédé de l'invention, le nombre total de stades à été réduit à 3-4, aucune préparation de solides n'est requise, et l'utilisation de produits chimiques coûteux (notamment de (BOC)2 (t-butoxycarbolly anhydride) et de plusieurs solvants ou réactifs chimiques a été exclue.

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