The present invention relates to an improved process for preparing 2-[(2E)-2-fluoro-2-(3-piperidinylidene)ethyl]-1H-isoindole-1,3(2H)-dione, or a salt thereof, which is an intermediate in the synthesis route of the antibacterial compound 7-[(3E)-3-(2-amino-1-fluoroethylidene)-1-piperidinyl]-1-cyclopropyl-6-fluoro-1,4-dihydro-8-methoxy-4-oxo 3-quinolinecarboxylic acid.
本发明涉及一种改进的制备2-[(2E)-2-
氟-2-(3-
哌啶亚甲基)乙基]-
1H-异吲哚-1,3(2H)-二酮或其盐的方法,该中间体是合成抗菌化合物7-[(3E)-3-(2-
氨基-1-
氟乙烯基)-1-
哌啶基]-1-环丙基-6-
氟-1,4-二氢-8-甲氧基-4-氧代-
3-喹啉羧酸的路线中的中间体。