Optical resolution of benzoxazines
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Aug 3, 1988
filing date -
Aug 3, 1987
priority date (Note) -
Expired
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Abstract
The invention relates to a process for producing a (.+-.)-3-alkyl-3,4-dihydro-2H-[1,4]benzoxazine derivate of formula (II) by stepwise racemization procedure. ##STR1## The invention further provides a process for optical resolution through the formation of a salt between a (.+-.)-benzoxazine compound and an optically active form of camphor-10-sulfonic acid. Without requiring the conventional expensive resolution reagents, this process not only assures production of an optically active isomer of compound (II) in high purity but also permits reuse of the optical resolution reagent.
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