Patent ID: 8207339

Claim:
A method for the synthesis of Moxifloxacin or ester thereof of Formula (X) or salt thereof: wherein R is an optionally substituted hydrogen or linear or branched C1-C4 alkyl or an optionally substituted phenyl or benzyl, comprising coupling a 1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinic acid or ester thereof of Formula (XI): wherein R is an optionally substituted hydrogen or linear or branched C1-C4 alkyl or an optionally substituted phenyl or benzyl, with a (4aS, 7aS)-octahydro-1H-pyrrole[3,4-b]pyridine of Formula (III): in the presence of a magnesium salt.