Process for preparing oxazines
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United States of America Patent
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Mar 17, 1998
Grant Date -
N/A
app pub date -
Jun 12, 1996
filing date -
Apr 25, 1989
priority date (Note) -
Expired
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Abstract
A process for preparing a compound of formula III ##STR1## which comprises decarboxylating a compound of formula V ##STR2## wherein R.sup.20 is alkoxy and R.sub.1, R.sub.2, and R.sub.3 are independently hydrogen or C.sub.1-8 alkyl.
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