Pyridone derivatives and process for preparing the same
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United States of America Patent
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Sep 17, 2002
Grant Date -
Dec 13, 2001
app pub date -
May 14, 2001
filing date -
Feb 25, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for preparing a pyridone derivative (4), which comprises reacting the compound (1) with a hypochlorite or a hypobromite or with lead tetraacetate to give the compound (2), and reacting the compound (2) with the compound (3). Said process is preferably especially from the standpoint of safety. ##STR1## wherein R.sup.1 is hydrogen, alkyl, substituted alkyl, etc.; Y.sup.1 is hydrogen, alky, substituted alky, etc.; Y.sup.2 and Y.sup.3 are indenpently hydrogen, halogen, etc.; and L is alkyl, substituted alkyl, etc.
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