805236-74-2Relevant articles and documents
A new industrial process for oxcarbazepine
Fuenfschilling, Peter C.,Zaugg, Werner,Beutler, Ulrich,Kaufmann, Daniel,Lohse, Olivier,Mutz, Jean-Paul,Onken, Ulrich,Reber, Jean-Louis,Shenton, David
, p. 272 - 277 (2012/12/24)
A novel industrial process for the antiepileptic drug oxcarbazepine 1 has been developed. Unlike the old process, the new process is free from halogenated solvents and can be performed in standard production equipment. It starts from commercially available 1,3-dihydro-1-phenyl-2H-indol-2-one 10. In the key step, an electrophilic ring closure reaction of 2-[(methoxycarbonyl)phenylamino] benzeneacetic acid 5 to 10,11-dihydro-10-oxo-5H-dibenz[b,f]azepine-5-carboxylic acid methyl ester 6 in poly phosphoric acid was applied. For the manufacture of 5, a highly efficient process using a dianion strategy was developed.