Method of preparing oxoquazepam
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United States of America Patent
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Jun 26, 2001
Grant Date -
N/A
app pub date -
Oct 1, 1999
filing date -
Dec 14, 1998
priority date (Note) -
Expired
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Abstract
A method of preparing oxoquazepam which comprises reacting 2,2,2-trifluoroethyl trifluoromethanesulfonate with 7-chloro-1,3-dihydro-5-(2-fluorophenyl)-2H-1,4-benzodiazepin-2-one in tetrahydrofuran or ethyl acetate in the presence of potassium carbonate under reflux. According to the method of the present invention, high purity oxoquazepam can be manufactured in high yields.
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