Alkyl 7,8-dihalo-4-oxo 1,4-dihydrobenzo (b)(1,8) naphthyridine-3-carboxylates and their preparation

摘要

New benzo[b][1,8]naphthyridine derivatives of general formula (I) in which R is a hydrogen atom or an alkyl, fluoroalkyl, cycloalkyl (3 to 6 C), alkoxy, alkylamino or protected alkylamino radical, Hal is F, Cl or Br if R' is hydrogen, or Hal and R' are F, and Alk is an alkyl radical, and their preparation. These new products can be used as intermediates for the preparation of biologically active products. IMAGE (I)