Online article for Non-subscribers

Pay per view

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact:

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

Paper | Regular issue | Vol 45, No. 1, 1997, pp.137-145
Published online, 1st January, 1970
DOI: 10.3987/COM-96-7649
An Improved Synthesis of Levofloxacin

Soon Bang Kang, Seonhee Park, Yong Hae Kim, and Youseung Kim*

*Division of Applied Science, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea


The benzoxazinecarboxylic acid (8), a precursor of levofloxacin (1), was prepared from (S)-2-amino-1-propanol (2) in 4 steps in good overall yield. The synthesis is characterized by one pot construction of 8 from the useful benzoylacrylates (7) which are effectively prepared in three steps. The key intermediates (7)were obtained from 2-nitrobenzoyl derivative (6a) and 2-fluorobenzoyl derivative (6b) through acylation of the acrylates (5), respectively.