171176-56-0Relevant articles and documents
Synthesis of trovafloxacin using various (1α,5α,6α)-3-azabicyclo[3.1.0]hexane derivatives
Norris, Timothy,Braish, Tamim F.,Butters, Michael,DeVries, Keith M.,Hawkins, Joel M.,Massett, Stephen S.,Rose, Peter R.,Santafianos, Dinos,Sklavounos, Constantine
, p. 1615 - 1622 (2007/10/03)
Trovafloxacin, a novel broad spectrum antibacterial, contains the unusual (1α,5α,6α)-3-azabicyclo[3.1.0]hexane ring system. The prototype of the industrial synthesis of this ring system and possible mechanistic pathways to exclusive formation of the exo or 6α-nitro derivative 4 are described, which leads to the key 6a-nitro-3-azabicyclo[3.1.0]hexane intermediate 10. The synthesis of 6a-amino-3-azabicyclo[3.1.0]hexane 16 and useful protected cxo 6-amino derivatives 15 and 17 follows from 10. These can be coupled with the 7-chloronaphthyridone 18 to yield protected trovafloxacin compounds 20-22 in good yield. The ethyl ester of trovafloxacin 21 can also be accessed from the product of coupling 19, derived from 18 and the exo 6-nitro-3-azabicyclo[3.1.0]hexane compound 12. Removal of protecting groups from 20-22 with methanesulfonic acid yields trovafloxacin mesylate from which trovafloxacin zwitterion 1 can be liberated with base treatment. Zwitterion l can also be prepared directly from 16 tosylate salt and naphthyridone-2-carboxylic acid 26. The Royal Society of Chemistry 2000.
Process for preparing derivatives of azabicyclo naphthyridine carboxylic acid comprising a dipeptide
-
, (2008/06/13)
A multi-step process for preparing a dipeptide derivative of 7-(6-amino-3-azabicyclo?3.1.0.!hex-3-yl)-6-fluoro-1-(2,4-difluorophenyl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid, in the form of a pharmaceutically acceptable acid addition salt is disclosed.
