Process for the preparation of 7 alpha-alkoxycephem derivatives
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 19, 1993
Grant Date -
N/A
app pub date -
Apr 25, 1991
filing date -
May 22, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
There is provided a process for preparing a compound of the formula (I): ##STR1## wherein R.sub.1 is an organic residue, R.sub.2 is a hydrogen or a chlorine atom, a methoxy, ethoxy or an acetoxy group, and n represents 0, 1 or 2. The process comprises reacting a compound of the formula (II): ##STR2## wherein R.sub.2 and n are as defined above, with an inorganic or organic nitrite, in an alcohol R.sub.1 OH, wherein R.sub.1 is as defined above, or in a mixture R.sub.1 OH-organic solvent in the presence of an inorganic or organic acid. The compounds of the formula (I) are known intermediates in the synthesis of human leucocyte elastase inhibitors (HLE).
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully